diff --git a/misc/dashboard/builder/main.go b/misc/dashboard/builder/main.go
index 6168eb34893..baffc807dcf 100644
--- a/misc/dashboard/builder/main.go
+++ b/misc/dashboard/builder/main.go
@@ -24,9 +24,9 @@ const (
 	codeProject      = "go"
 	codePyScript     = "misc/dashboard/googlecode_upload.py"
 	hgUrl            = "https://go.googlecode.com/hg/"
-	waitInterval     = 30e9 // time to wait before checking for new revs
 	mkdirPerm        = 0750
-	pkgBuildInterval = 1e9 * 60 * 60 * 24 // rebuild packages every 24 hours
+	waitInterval     = 30 * time.Second // time to wait before checking for new revs
+	pkgBuildInterval = 24 * time.Hour   // rebuild packages every 24 hours
 )
 
 // These variables are copied from the gobuilder's environment
@@ -131,7 +131,7 @@ func main() {
 	// check for new commits and build them
 	for {
 		built := false
-		t := time.Nanoseconds()
+		t := time.Now()
 		if *parallel {
 			done := make(chan bool)
 			for _, b := range builders {
@@ -152,9 +152,9 @@ func main() {
 			time.Sleep(waitInterval)
 		}
 		// sleep if we're looping too fast.
-		t1 := time.Nanoseconds() - t
-		if t1 < waitInterval {
-			time.Sleep(waitInterval - t1)
+		dt := time.Now().Sub(t)
+		if dt < waitInterval {
+			time.Sleep(waitInterval - dt)
 		}
 	}
 }
@@ -194,7 +194,7 @@ func NewBuilder(builder string) (*Builder, error) {
 // a new release tag is found.
 func (b *Builder) buildExternal() {
 	var prevTag string
-	var nextBuild int64
+	var nextBuild time.Time
 	for {
 		time.Sleep(waitInterval)
 		err := run(nil, goroot, "hg", "pull", "-u")
@@ -213,7 +213,7 @@ func (b *Builder) buildExternal() {
 		// don't rebuild if there's no new release
 		// and it's been less than pkgBuildInterval
 		// nanoseconds since the last build.
-		if tag == prevTag && time.Nanoseconds() < nextBuild {
+		if tag == prevTag && time.Now().Before(nextBuild) {
 			continue
 		}
 		// build will also build the packages
@@ -222,7 +222,7 @@ func (b *Builder) buildExternal() {
 			continue
 		}
 		prevTag = tag
-		nextBuild = time.Nanoseconds() + pkgBuildInterval
+		nextBuild = time.Now().Add(pkgBuildInterval)
 	}
 }
 
diff --git a/src/cmd/godoc/filesystem.go b/src/cmd/godoc/filesystem.go
index ece9ebbf3e2..aa79b3693f5 100644
--- a/src/cmd/godoc/filesystem.go
+++ b/src/cmd/godoc/filesystem.go
@@ -13,13 +13,14 @@ import (
 	"io"
 	"io/ioutil"
 	"os"
+	"time"
 )
 
 // The FileInfo interface provides access to file information.
 type FileInfo interface {
 	Name() string
 	Size() int64
-	Mtime_ns() int64
+	ModTime() time.Time
 	IsRegular() bool
 	IsDirectory() bool
 }
@@ -64,8 +65,8 @@ func (fi osFI) Size() int64 {
 	return fi.FileInfo.Size
 }
 
-func (fi osFI) Mtime_ns() int64 {
-	return fi.FileInfo.Mtime_ns
+func (fi osFI) ModTime() time.Time {
+	return fi.FileInfo.ModTime
 }
 
 // osFS is the OS-specific implementation of FileSystem
diff --git a/src/cmd/godoc/godoc.go b/src/cmd/godoc/godoc.go
index b66617431e9..e3413544a95 100644
--- a/src/cmd/godoc/godoc.go
+++ b/src/cmd/godoc/godoc.go
@@ -35,9 +35,9 @@ type delayTime struct {
 	RWValue
 }
 
-func (dt *delayTime) backoff(max int) {
+func (dt *delayTime) backoff(max time.Duration) {
 	dt.mutex.Lock()
-	v := dt.value.(int) * 2
+	v := dt.value.(time.Duration) * 2
 	if v > max {
 		v = max
 	}
@@ -207,7 +207,7 @@ func updateFilterFile() {
 	// update filter file
 	if err := writeFileAtomically(*filter, buf.Bytes()); err != nil {
 		log.Printf("writeFileAtomically(%s): %s", *filter, err)
-		filterDelay.backoff(24 * 60) // back off exponentially, but try at least once a day
+		filterDelay.backoff(24 * time.Hour) // back off exponentially, but try at least once a day
 	} else {
 		filterDelay.set(*filterMin) // revert to regular filter update schedule
 	}
@@ -230,7 +230,7 @@ func initDirTrees() {
 
 	// start filter update goroutine, if enabled.
 	if *filter != "" && *filterMin > 0 {
-		filterDelay.set(*filterMin) // initial filter update delay
+		filterDelay.set(time.Duration(*filterMin) * time.Minute) // initial filter update delay
 		go func() {
 			for {
 				if *verbose {
@@ -238,10 +238,11 @@ func initDirTrees() {
 				}
 				updateFilterFile()
 				delay, _ := filterDelay.get()
+				dt := delay.(time.Duration)
 				if *verbose {
-					log.Printf("next filter update in %dmin", delay.(int))
+					log.Printf("next filter update in %s", dt)
 				}
-				time.Sleep(int64(delay.(int)) * 60e9)
+				time.Sleep(dt)
 			}
 		}()
 	}
@@ -389,8 +390,8 @@ func fileInfoNameFunc(fi FileInfo) string {
 }
 
 func fileInfoTimeFunc(fi FileInfo) string {
-	if t := fi.Mtime_ns(); t != 0 {
-		return time.SecondsToLocalTime(t / 1e9).String()
+	if t := fi.ModTime(); t.Unix() != 0 {
+		return t.Local().String()
 	}
 	return "" // don't return epoch if time is obviously not set
 }
@@ -876,7 +877,7 @@ type PageInfo struct {
 	PDoc     *doc.PackageDoc // nil if no single package documentation
 	Examples []*doc.Example  // nil if no example code
 	Dirs     *DirList        // nil if no directory information
-	DirTime  int64           // directory time stamp in seconds since epoch
+	DirTime  time.Time       // directory time stamp
 	DirFlat  bool            // if set, show directory in a flat (non-indented) manner
 	IsPkg    bool            // false if this is not documenting a real package
 	Err      error           // I/O error or nil
@@ -906,7 +907,7 @@ func fsReadDir(dir string) ([]*os.FileInfo, error) {
 		if f.IsDirectory() {
 			mode = S_IFDIR
 		}
-		osfi[i] = &os.FileInfo{Name: f.Name(), Size: f.Size(), Mtime_ns: f.Mtime_ns(), Mode: mode}
+		osfi[i] = &os.FileInfo{Name: f.Name(), Size: f.Size(), ModTime: f.ModTime(), Mode: mode}
 	}
 	return osfi, nil
 }
@@ -1075,7 +1076,7 @@ func (h *httpHandler) getPageInfo(abspath, relpath, pkgname string, mode PageInf
 
 	// get directory information
 	var dir *Directory
-	var timestamp int64
+	var timestamp time.Time
 	if tree, ts := fsTree.get(); tree != nil && tree.(*Directory) != nil {
 		// directory tree is present; lookup respective directory
 		// (may still fail if the file system was updated and the
@@ -1112,7 +1113,7 @@ func (h *httpHandler) getPageInfo(abspath, relpath, pkgname string, mode PageInf
 		// note: cannot use path filter here because in general
 		//       it doesn't contain the fsTree path
 		dir = newDirectory(abspath, nil, 1)
-		timestamp = time.Seconds()
+		timestamp = time.Now()
 	}
 
 	return PageInfo{
@@ -1172,7 +1173,7 @@ func (h *httpHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	default:
 		title = "Directory " + relativeURL(info.Dirname)
 		if *showTimestamps {
-			subtitle = "Last update: " + time.SecondsToLocalTime(info.DirTime).String()
+			subtitle = "Last update: " + info.DirTime.String()
 		}
 	}
 
@@ -1238,7 +1239,7 @@ func lookup(query string) (result SearchResult) {
 
 	// is the result accurate?
 	if *indexEnabled {
-		if _, ts := fsModified.get(); timestamp < ts {
+		if _, ts := fsModified.get(); timestamp.Before(ts) {
 			// The index is older than the latest file system change under godoc's observation.
 			result.Alert = "Indexing in progress: result may be inaccurate"
 		}
@@ -1286,7 +1287,7 @@ func invalidateIndex() {
 func indexUpToDate() bool {
 	_, fsTime := fsModified.get()
 	_, siTime := searchIndex.get()
-	return fsTime <= siTime
+	return !fsTime.After(siTime)
 }
 
 // feedDirnames feeds the directory names of all directories
@@ -1343,12 +1344,12 @@ func updateIndex() {
 	if *verbose {
 		log.Printf("updating index...")
 	}
-	start := time.Nanoseconds()
+	start := time.Now()
 	index := NewIndex(fsDirnames(), *maxResults > 0, *indexThrottle)
-	stop := time.Nanoseconds()
+	stop := time.Now()
 	searchIndex.set(index)
 	if *verbose {
-		secs := float64((stop-start)/1e6) / 1e3
+		secs := stop.Sub(start).Seconds()
 		stats := index.Stats()
 		log.Printf("index updated (%gs, %d bytes of source, %d files, %d lines, %d unique words, %d spots)",
 			secs, stats.Bytes, stats.Files, stats.Lines, stats.Words, stats.Spots)
@@ -1372,10 +1373,10 @@ func indexer() {
 			// index possibly out of date - make a new one
 			updateIndex()
 		}
-		var delay int64 = 60 * 1e9 // by default, try every 60s
+		delay := 60 * time.Second // by default, try every 60s
 		if *testDir != "" {
 			// in test mode, try once a second for fast startup
-			delay = 1 * 1e9
+			delay = 1 * time.Second
 		}
 		time.Sleep(delay)
 	}
diff --git a/src/cmd/godoc/httpzip.go b/src/cmd/godoc/httpzip.go
index a6c5ed654f5..88b2e8f4234 100644
--- a/src/cmd/godoc/httpzip.go
+++ b/src/cmd/godoc/httpzip.go
@@ -32,6 +32,7 @@ import (
 	"path"
 	"sort"
 	"strings"
+	"time"
 )
 
 // We cannot import syscall on app engine.
@@ -77,17 +78,18 @@ func (f *httpZipFile) Readdir(count int) ([]os.FileInfo, error) {
 		}
 		name := e.Name[len(dirname):] // local name
 		var mode uint32
-		var size, mtime_ns int64
+		var size int64
+		var mtime time.Time
 		if i := strings.IndexRune(name, '/'); i >= 0 {
 			// We infer directories from files in subdirectories.
 			// If we have x/y, return a directory entry for x.
 			name = name[0:i] // keep local directory name only
 			mode = S_IFDIR
-			// no size or mtime_ns for directories
+			// no size or mtime for directories
 		} else {
 			mode = S_IFREG
 			size = int64(e.UncompressedSize)
-			mtime_ns = e.Mtime_ns()
+			mtime = e.ModTime()
 		}
 		// If we have x/y and x/z, don't return two directory entries for x.
 		// TODO(gri): It should be possible to do this more efficiently
@@ -95,10 +97,10 @@ func (f *httpZipFile) Readdir(count int) ([]os.FileInfo, error) {
 		// (via two binary searches).
 		if name != prevname {
 			list = append(list, os.FileInfo{
-				Name:     name,
-				Mode:     mode,
-				Size:     size,
-				Mtime_ns: mtime_ns,
+				Name:    name,
+				Mode:    mode,
+				Size:    size,
+				ModTime: mtime,
 			})
 			prevname = name
 			count--
@@ -142,10 +144,10 @@ func (fs *httpZipFS) Open(name string) (http.File, error) {
 		return &httpZipFile{
 			path,
 			os.FileInfo{
-				Name:     name,
-				Mode:     S_IFREG,
-				Size:     int64(f.UncompressedSize),
-				Mtime_ns: f.Mtime_ns(),
+				Name:    name,
+				Mode:    S_IFREG,
+				Size:    int64(f.UncompressedSize),
+				ModTime: f.ModTime(),
 			},
 			rc,
 			nil,
@@ -158,7 +160,7 @@ func (fs *httpZipFS) Open(name string) (http.File, error) {
 		os.FileInfo{
 			Name: name,
 			Mode: S_IFDIR,
-			// no size or mtime_ns for directories
+			// no size or mtime for directories
 		},
 		nil,
 		fs.list[index:],
diff --git a/src/cmd/godoc/main.go b/src/cmd/godoc/main.go
index e1a175d72df..47369a3b4c8 100644
--- a/src/cmd/godoc/main.go
+++ b/src/cmd/godoc/main.go
@@ -141,10 +141,10 @@ func dosync(w http.ResponseWriter, r *http.Request) {
 	case 1:
 		// sync failed because no files changed;
 		// don't change the package tree
-		syncDelay.set(*syncMin) //  revert to regular sync schedule
+		syncDelay.set(time.Duration(*syncMin) * time.Minute) //  revert to regular sync schedule
 	default:
 		// sync failed because of an error - back off exponentially, but try at least once a day
-		syncDelay.backoff(24 * 60)
+		syncDelay.backoff(24 * time.Hour)
 	}
 }
 
@@ -328,10 +328,11 @@ func main() {
 				for {
 					dosync(nil, nil)
 					delay, _ := syncDelay.get()
+					dt := delay.(time.Duration)
 					if *verbose {
-						log.Printf("next sync in %dmin", delay.(int))
+						log.Printf("next sync in %s", dt)
 					}
-					time.Sleep(int64(delay.(int)) * 60e9)
+					time.Sleep(dt)
 				}
 			}()
 		}
diff --git a/src/cmd/godoc/throttle.go b/src/cmd/godoc/throttle.go
index 19349280276..ac18b44e0e5 100644
--- a/src/cmd/godoc/throttle.go
+++ b/src/cmd/godoc/throttle.go
@@ -10,15 +10,15 @@ import "time"
 // calling the Throttle method repeatedly.
 //
 type Throttle struct {
-	f  float64 // f = (1-r)/r for 0 < r < 1
-	tm int64   // minimum run time slice; >= 0
-	tr int64   // accumulated time running
-	ts int64   // accumulated time stopped
-	tt int64   // earliest throttle time (= time Throttle returned + tm)
+	f  float64       // f = (1-r)/r for 0 < r < 1
+	dt time.Duration // minimum run time slice; >= 0
+	tr time.Duration // accumulated time running
+	ts time.Duration // accumulated time stopped
+	tt time.Time     // earliest throttle time (= time Throttle returned + tm)
 }
 
 // NewThrottle creates a new Throttle with a throttle value r and
-// a minimum allocated run time slice of tm nanoseconds:
+// a minimum allocated run time slice of dt:
 //
 //	r == 0: "empty" throttle; the goroutine is always sleeping
 //	r == 1: full throttle; the goroutine is never sleeping
@@ -26,9 +26,9 @@ type Throttle struct {
 // A value of r == 0.6 throttles a goroutine such that it runs
 // approx. 60% of the time, and sleeps approx. 40% of the time.
 // Values of r < 0 or r > 1 are clamped down to values between 0 and 1.
-// Values of tm < 0 are set to 0.
+// Values of dt < 0 are set to 0.
 //
-func NewThrottle(r float64, tm int64) *Throttle {
+func NewThrottle(r float64, dt time.Duration) *Throttle {
 	var f float64
 	switch {
 	case r <= 0:
@@ -39,10 +39,10 @@ func NewThrottle(r float64, tm int64) *Throttle {
 		// 0 < r < 1
 		f = (1 - r) / r
 	}
-	if tm < 0 {
-		tm = 0
+	if dt < 0 {
+		dt = 0
 	}
-	return &Throttle{f: f, tm: tm, tt: time.Nanoseconds() + tm}
+	return &Throttle{f: f, dt: dt, tt: time.Now().Add(dt)}
 }
 
 // Throttle calls time.Sleep such that over time the ratio tr/ts between
@@ -55,13 +55,13 @@ func (p *Throttle) Throttle() {
 		select {} // always sleep
 	}
 
-	t0 := time.Nanoseconds()
-	if t0 < p.tt {
+	t0 := time.Now()
+	if t0.Before(p.tt) {
 		return // keep running (minimum time slice not exhausted yet)
 	}
 
 	// accumulate running time
-	p.tr += t0 - (p.tt - p.tm)
+	p.tr += t0.Sub(p.tt) + p.dt
 
 	// compute sleep time
 	// Over time we want:
@@ -75,14 +75,14 @@ func (p *Throttle) Throttle() {
 	// After some incremental run time δr added to the total run time
 	// tr, the incremental sleep-time δs to get to the same ratio again
 	// after waking up from time.Sleep is:
-	if δs := int64(float64(p.tr)*p.f) - p.ts; δs > 0 {
+	if δs := time.Duration(float64(p.tr)*p.f) - p.ts; δs > 0 {
 		time.Sleep(δs)
 	}
 
 	// accumulate (actual) sleep time
-	t1 := time.Nanoseconds()
-	p.ts += t1 - t0
+	t1 := time.Now()
+	p.ts += t1.Sub(t0)
 
 	// set earliest next throttle time
-	p.tt = t1 + p.tm
+	p.tt = t1.Add(p.dt)
 }
diff --git a/src/cmd/godoc/utils.go b/src/cmd/godoc/utils.go
index b572647681e..be0bdc30670 100644
--- a/src/cmd/godoc/utils.go
+++ b/src/cmd/godoc/utils.go
@@ -24,17 +24,17 @@ import (
 type RWValue struct {
 	mutex     sync.RWMutex
 	value     interface{}
-	timestamp int64 // time of last set(), in seconds since epoch
+	timestamp time.Time // time of last set()
 }
 
 func (v *RWValue) set(value interface{}) {
 	v.mutex.Lock()
 	v.value = value
-	v.timestamp = time.Seconds()
+	v.timestamp = time.Now()
 	v.mutex.Unlock()
 }
 
-func (v *RWValue) get() (interface{}, int64) {
+func (v *RWValue) get() (interface{}, time.Time) {
 	v.mutex.RLock()
 	defer v.mutex.RUnlock()
 	return v.value, v.timestamp
diff --git a/src/cmd/godoc/zip.go b/src/cmd/godoc/zip.go
index 20121422282..274999ba00b 100644
--- a/src/cmd/godoc/zip.go
+++ b/src/cmd/godoc/zip.go
@@ -25,6 +25,7 @@ import (
 	"path"
 	"sort"
 	"strings"
+	"time"
 )
 
 // zipFI is the zip-file based implementation of FileInfo
@@ -44,11 +45,11 @@ func (fi zipFI) Size() int64 {
 	return 0 // directory
 }
 
-func (fi zipFI) Mtime_ns() int64 {
+func (fi zipFI) ModTime() time.Time {
 	if f := fi.file; f != nil {
-		return f.Mtime_ns()
+		return f.ModTime()
 	}
-	return 0 // directory has no modified time entry
+	return time.Time{} // directory has no modified time entry
 }
 
 func (fi zipFI) IsDirectory() bool {
diff --git a/src/cmd/gotest/gotest.go b/src/cmd/gotest/gotest.go
index 536e01f971b..2e8e20ccf0b 100644
--- a/src/cmd/gotest/gotest.go
+++ b/src/cmd/gotest/gotest.go
@@ -56,10 +56,10 @@ var (
 
 // elapsed returns the number of seconds since gotest started.
 func elapsed() float64 {
-	return float64(time.Nanoseconds()-start) / 1e9
+	return time.Now().Sub(start).Seconds()
 }
 
-var start = time.Nanoseconds()
+var start = time.Now()
 
 // File represents a file that contains tests.
 type File struct {
@@ -293,10 +293,10 @@ func runTestWithArgs(binary string) {
 func doRun(argv []string, returnStdout bool) string {
 	if xFlag {
 		fmt.Printf("gotest %.2fs: %s\n", elapsed(), strings.Join(argv, " "))
-		t := -time.Nanoseconds()
+		start := time.Now()
 		defer func() {
-			t += time.Nanoseconds()
-			fmt.Printf(" [+%.2fs]\n", float64(t)/1e9)
+			t := time.Now().Sub(start)
+			fmt.Printf(" [+%.2fs]\n", t.Seconds())
 		}()
 	}
 	command := argv[0]
diff --git a/src/pkg/archive/tar/common.go b/src/pkg/archive/tar/common.go
index 67355086a63..fc7a40923cd 100644
--- a/src/pkg/archive/tar/common.go
+++ b/src/pkg/archive/tar/common.go
@@ -11,41 +11,42 @@
 //   http://www.gnu.org/software/tar/manual/html_node/Standard.html
 package tar
 
+import "time"
+
 const (
 	blockSize = 512
 
 	// Types
-	TypeReg           = '0'    // regular file.
-	TypeRegA          = '\x00' // regular file.
-	TypeLink          = '1'    // hard link.
-	TypeSymlink       = '2'    // symbolic link.
-	TypeChar          = '3'    // character device node.
-	TypeBlock         = '4'    // block device node.
-	TypeDir           = '5'    // directory.
-	TypeFifo          = '6'    // fifo node.
-	TypeCont          = '7'    // reserved.
-	TypeXHeader       = 'x'    // extended header.
-	TypeXGlobalHeader = 'g'    // global extended header.
+	TypeReg           = '0'    // regular file
+	TypeRegA          = '\x00' // regular file
+	TypeLink          = '1'    // hard link
+	TypeSymlink       = '2'    // symbolic link
+	TypeChar          = '3'    // character device node
+	TypeBlock         = '4'    // block device node
+	TypeDir           = '5'    // directory
+	TypeFifo          = '6'    // fifo node
+	TypeCont          = '7'    // reserved
+	TypeXHeader       = 'x'    // extended header
+	TypeXGlobalHeader = 'g'    // global extended header
 )
 
 // A Header represents a single header in a tar archive.
 // Some fields may not be populated.
 type Header struct {
-	Name     string // name of header file entry.
-	Mode     int64  // permission and mode bits.
-	Uid      int    // user id of owner.
-	Gid      int    // group id of owner.
-	Size     int64  // length in bytes.
-	Mtime    int64  // modified time; seconds since epoch.
-	Typeflag byte   // type of header entry.
-	Linkname string // target name of link.
-	Uname    string // user name of owner.
-	Gname    string // group name of owner.
-	Devmajor int64  // major number of character or block device.
-	Devminor int64  // minor number of character or block device.
-	Atime    int64  // access time; seconds since epoch.
-	Ctime    int64  // status change time; seconds since epoch.
-
+	Name       string    // name of header file entry
+	Mode       int64     // permission and mode bits
+	Uid        int       // user id of owner
+	Gid        int       // group id of owner
+	Size       int64     // length in bytes
+	ModTime    time.Time // modified time
+	Typeflag   byte      // type of header entry
+	Linkname   string    // target name of link
+	Uname      string    // user name of owner
+	Gname      string    // group name of owner
+	Devmajor   int64     // major number of character or block device
+	Devminor   int64     // minor number of character or block device
+	AccessTime time.Time // access time
+	ChangeTime time.Time // status change time
 }
 
 var zeroBlock = make([]byte, blockSize)
diff --git a/src/pkg/archive/tar/reader.go b/src/pkg/archive/tar/reader.go
index facba2cc7a3..76955e2ec03 100644
--- a/src/pkg/archive/tar/reader.go
+++ b/src/pkg/archive/tar/reader.go
@@ -14,6 +14,7 @@ import (
 	"io/ioutil"
 	"os"
 	"strconv"
+	"time"
 )
 
 var (
@@ -141,7 +142,7 @@ func (tr *Reader) readHeader() *Header {
 	hdr.Uid = int(tr.octal(s.next(8)))
 	hdr.Gid = int(tr.octal(s.next(8)))
 	hdr.Size = tr.octal(s.next(12))
-	hdr.Mtime = tr.octal(s.next(12))
+	hdr.ModTime = time.Unix(tr.octal(s.next(12)), 0)
 	s.next(8) // chksum
 	hdr.Typeflag = s.next(1)[0]
 	hdr.Linkname = cString(s.next(100))
@@ -178,8 +179,8 @@ func (tr *Reader) readHeader() *Header {
 			prefix = cString(s.next(155))
 		case "star":
 			prefix = cString(s.next(131))
-			hdr.Atime = tr.octal(s.next(12))
-			hdr.Ctime = tr.octal(s.next(12))
+			hdr.AccessTime = time.Unix(tr.octal(s.next(12)), 0)
+			hdr.ChangeTime = time.Unix(tr.octal(s.next(12)), 0)
 		}
 		if len(prefix) > 0 {
 			hdr.Name = prefix + "/" + hdr.Name
diff --git a/src/pkg/archive/tar/reader_test.go b/src/pkg/archive/tar/reader_test.go
index 00eea6b62d7..794cedb2d75 100644
--- a/src/pkg/archive/tar/reader_test.go
+++ b/src/pkg/archive/tar/reader_test.go
@@ -12,6 +12,7 @@ import (
 	"os"
 	"reflect"
 	"testing"
+	"time"
 )
 
 type untarTest struct {
@@ -29,7 +30,7 @@ var gnuTarTest = &untarTest{
 			Uid:      73025,
 			Gid:      5000,
 			Size:     5,
-			Mtime:    1244428340,
+			ModTime:  time.Unix(1244428340, 0),
 			Typeflag: '0',
 			Uname:    "dsymonds",
 			Gname:    "eng",
@@ -40,7 +41,7 @@ var gnuTarTest = &untarTest{
 			Uid:      73025,
 			Gid:      5000,
 			Size:     11,
-			Mtime:    1244436044,
+			ModTime:  time.Unix(1244436044, 0),
 			Typeflag: '0',
 			Uname:    "dsymonds",
 			Gname:    "eng",
@@ -58,30 +59,30 @@ var untarTests = []*untarTest{
 		file: "testdata/star.tar",
 		headers: []*Header{
 			&Header{
-				Name:     "small.txt",
-				Mode:     0640,
-				Uid:      73025,
-				Gid:      5000,
-				Size:     5,
-				Mtime:    1244592783,
-				Typeflag: '0',
-				Uname:    "dsymonds",
-				Gname:    "eng",
-				Atime:    1244592783,
-				Ctime:    1244592783,
+				Name:       "small.txt",
+				Mode:       0640,
+				Uid:        73025,
+				Gid:        5000,
+				Size:       5,
+				ModTime:    time.Unix(1244592783, 0),
+				Typeflag:   '0',
+				Uname:      "dsymonds",
+				Gname:      "eng",
+				AccessTime: time.Unix(1244592783, 0),
+				ChangeTime: time.Unix(1244592783, 0),
 			},
 			&Header{
-				Name:     "small2.txt",
-				Mode:     0640,
-				Uid:      73025,
-				Gid:      5000,
-				Size:     11,
-				Mtime:    1244592783,
-				Typeflag: '0',
-				Uname:    "dsymonds",
-				Gname:    "eng",
-				Atime:    1244592783,
-				Ctime:    1244592783,
+				Name:       "small2.txt",
+				Mode:       0640,
+				Uid:        73025,
+				Gid:        5000,
+				Size:       11,
+				ModTime:    time.Unix(1244592783, 0),
+				Typeflag:   '0',
+				Uname:      "dsymonds",
+				Gname:      "eng",
+				AccessTime: time.Unix(1244592783, 0),
+				ChangeTime: time.Unix(1244592783, 0),
 			},
 		},
 	},
@@ -94,7 +95,7 @@ var untarTests = []*untarTest{
 				Uid:      73025,
 				Gid:      5000,
 				Size:     5,
-				Mtime:    1244593104,
+				ModTime:  time.Unix(1244593104, 0),
 				Typeflag: '\x00',
 			},
 			&Header{
@@ -103,7 +104,7 @@ var untarTests = []*untarTest{
 				Uid:      73025,
 				Gid:      5000,
 				Size:     11,
-				Mtime:    1244593104,
+				ModTime:  time.Unix(1244593104, 0),
 				Typeflag: '\x00',
 			},
 		},
diff --git a/src/pkg/archive/tar/writer.go b/src/pkg/archive/tar/writer.go
index 222df90782c..b9310b3f189 100644
--- a/src/pkg/archive/tar/writer.go
+++ b/src/pkg/archive/tar/writer.go
@@ -127,19 +127,19 @@ func (tw *Writer) WriteHeader(hdr *Header) error {
 	// TODO(dsymonds): handle names longer than 100 chars
 	copy(s.next(100), []byte(hdr.Name))
 
-	tw.octal(s.next(8), hdr.Mode)          // 100:108
-	tw.numeric(s.next(8), int64(hdr.Uid))  // 108:116
-	tw.numeric(s.next(8), int64(hdr.Gid))  // 116:124
-	tw.numeric(s.next(12), hdr.Size)       // 124:136
-	tw.numeric(s.next(12), hdr.Mtime)      // 136:148
-	s.next(8)                              // chksum (148:156)
-	s.next(1)[0] = hdr.Typeflag            // 156:157
-	tw.cString(s.next(100), hdr.Linkname)  // linkname (157:257)
-	copy(s.next(8), []byte("ustar\x0000")) // 257:265
-	tw.cString(s.next(32), hdr.Uname)      // 265:297
-	tw.cString(s.next(32), hdr.Gname)      // 297:329
-	tw.numeric(s.next(8), hdr.Devmajor)    // 329:337
-	tw.numeric(s.next(8), hdr.Devminor)    // 337:345
+	tw.octal(s.next(8), hdr.Mode)              // 100:108
+	tw.numeric(s.next(8), int64(hdr.Uid))      // 108:116
+	tw.numeric(s.next(8), int64(hdr.Gid))      // 116:124
+	tw.numeric(s.next(12), hdr.Size)           // 124:136
+	tw.numeric(s.next(12), hdr.ModTime.Unix()) // 136:148
+	s.next(8)                                  // chksum (148:156)
+	s.next(1)[0] = hdr.Typeflag                // 156:157
+	tw.cString(s.next(100), hdr.Linkname)      // linkname (157:257)
+	copy(s.next(8), []byte("ustar\x0000"))     // 257:265
+	tw.cString(s.next(32), hdr.Uname)          // 265:297
+	tw.cString(s.next(32), hdr.Gname)          // 297:329
+	tw.numeric(s.next(8), hdr.Devmajor)        // 329:337
+	tw.numeric(s.next(8), hdr.Devminor)        // 337:345
 
 	// Use the GNU magic instead of POSIX magic if we used any GNU extensions.
 	if tw.usedBinary {
diff --git a/src/pkg/archive/tar/writer_test.go b/src/pkg/archive/tar/writer_test.go
index 6cc93868820..8d7ed32d32e 100644
--- a/src/pkg/archive/tar/writer_test.go
+++ b/src/pkg/archive/tar/writer_test.go
@@ -11,6 +11,7 @@ import (
 	"io/ioutil"
 	"testing"
 	"testing/iotest"
+	"time"
 )
 
 type writerTestEntry struct {
@@ -38,7 +39,7 @@ var writerTests = []*writerTest{
 					Uid:      73025,
 					Gid:      5000,
 					Size:     5,
-					Mtime:    1246508266,
+					ModTime:  time.Unix(1246508266, 0),
 					Typeflag: '0',
 					Uname:    "dsymonds",
 					Gname:    "eng",
@@ -52,7 +53,7 @@ var writerTests = []*writerTest{
 					Uid:      73025,
 					Gid:      5000,
 					Size:     11,
-					Mtime:    1245217492,
+					ModTime:  time.Unix(1245217492, 0),
 					Typeflag: '0',
 					Uname:    "dsymonds",
 					Gname:    "eng",
@@ -66,7 +67,7 @@ var writerTests = []*writerTest{
 					Uid:      1000,
 					Gid:      1000,
 					Size:     0,
-					Mtime:    1314603082,
+					ModTime:  time.Unix(1314603082, 0),
 					Typeflag: '2',
 					Linkname: "small.txt",
 					Uname:    "strings",
@@ -89,7 +90,7 @@ var writerTests = []*writerTest{
 					Uid:      73025,
 					Gid:      5000,
 					Size:     16 << 30,
-					Mtime:    1254699560,
+					ModTime:  time.Unix(1254699560, 0),
 					Typeflag: '0',
 					Uname:    "dsymonds",
 					Gname:    "eng",
diff --git a/src/pkg/archive/zip/reader_test.go b/src/pkg/archive/zip/reader_test.go
index ca0b04e2bba..8c0ecaa4386 100644
--- a/src/pkg/archive/zip/reader_test.go
+++ b/src/pkg/archive/zip/reader_test.go
@@ -164,8 +164,8 @@ func readTestFile(t *testing.T, ft ZipTestFile, f *File) {
 		t.Error(err)
 		return
 	}
-	if got, want := f.Mtime_ns()/1e9, mtime.Seconds(); got != want {
-		t.Errorf("%s: mtime=%s (%d); want %s (%d)", f.Name, time.SecondsToUTC(got), got, mtime, want)
+	if ft := f.ModTime(); !ft.Equal(mtime) {
+		t.Errorf("%s: mtime=%s, want %s", f.Name, ft, mtime)
 	}
 
 	testFileMode(t, f, ft.Mode)
diff --git a/src/pkg/archive/zip/struct.go b/src/pkg/archive/zip/struct.go
index b862b5a6acb..43c04bb27b2 100644
--- a/src/pkg/archive/zip/struct.go
+++ b/src/pkg/archive/zip/struct.go
@@ -11,8 +11,10 @@ This package does not support ZIP64 or disk spanning.
 */
 package zip
 
-import "errors"
-import "time"
+import (
+	"errors"
+	"time"
+)
 
 // Compression methods.
 const (
@@ -74,24 +76,26 @@ func recoverError(errp *error) {
 // The resolution is 2s.
 // See: http://msdn.microsoft.com/en-us/library/ms724247(v=VS.85).aspx
 func msDosTimeToTime(dosDate, dosTime uint16) time.Time {
-	return time.Time{
+	return time.Date(
 		// date bits 0-4: day of month; 5-8: month; 9-15: years since 1980
-		Year:  int64(dosDate>>9 + 1980),
-		Month: int(dosDate >> 5 & 0xf),
-		Day:   int(dosDate & 0x1f),
+		int(dosDate>>9+1980),
+		time.Month(dosDate>>5&0xf),
+		int(dosDate&0x1f),
 
 		// time bits 0-4: second/2; 5-10: minute; 11-15: hour
-		Hour:   int(dosTime >> 11),
-		Minute: int(dosTime >> 5 & 0x3f),
-		Second: int(dosTime & 0x1f * 2),
-	}
+		int(dosTime>>11),
+		int(dosTime>>5&0x3f),
+		int(dosTime&0x1f*2),
+		0, // nanoseconds
+
+		time.UTC,
+	)
 }
 
-// Mtime_ns returns the modified time in ns since epoch.
+// ModTime returns the modification time.
 // The resolution is 2s.
-func (h *FileHeader) Mtime_ns() int64 {
-	t := msDosTimeToTime(h.ModifiedDate, h.ModifiedTime)
-	return t.Seconds() * 1e9
+func (h *FileHeader) ModTime() time.Time {
+	return msDosTimeToTime(h.ModifiedDate, h.ModifiedTime)
 }
 
 // Mode returns the permission and mode bits for the FileHeader.
diff --git a/src/pkg/compress/gzip/gunzip.go b/src/pkg/compress/gzip/gunzip.go
index a23e515e0e0..7c78b9e366d 100644
--- a/src/pkg/compress/gzip/gunzip.go
+++ b/src/pkg/compress/gzip/gunzip.go
@@ -13,6 +13,7 @@ import (
 	"hash"
 	"hash/crc32"
 	"io"
+	"time"
 )
 
 // BUG(nigeltao): Comments and Names don't properly map UTF-8 character codes outside of
@@ -42,11 +43,11 @@ var ChecksumError = errors.New("gzip checksum error")
 // The gzip file stores a header giving metadata about the compressed file.
 // That header is exposed as the fields of the Compressor and Decompressor structs.
 type Header struct {
-	Comment string // comment
-	Extra   []byte // "extra data"
-	Mtime   uint32 // modification time (seconds since January 1, 1970)
-	Name    string // file name
-	OS      byte   // operating system type
+	Comment string    // comment
+	Extra   []byte    // "extra data"
+	ModTime time.Time // modification time
+	Name    string    // file name
+	OS      byte      // operating system type
 }
 
 // An Decompressor is an io.Reader that can be read to retrieve
@@ -130,7 +131,7 @@ func (z *Decompressor) readHeader(save bool) error {
 	}
 	z.flg = z.buf[3]
 	if save {
-		z.Mtime = get4(z.buf[4:8])
+		z.ModTime = time.Unix(int64(get4(z.buf[4:8])), 0)
 		// z.buf[8] is xfl, ignored
 		z.OS = z.buf[9]
 	}
diff --git a/src/pkg/compress/gzip/gzip.go b/src/pkg/compress/gzip/gzip.go
index 94b0f1f85e2..07b91b66823 100644
--- a/src/pkg/compress/gzip/gzip.go
+++ b/src/pkg/compress/gzip/gzip.go
@@ -122,7 +122,7 @@ func (z *Compressor) Write(p []byte) (int, error) {
 		if z.Comment != "" {
 			z.buf[3] |= 0x10
 		}
-		put4(z.buf[4:8], z.Mtime)
+		put4(z.buf[4:8], uint32(z.ModTime.Unix()))
 		if z.level == BestCompression {
 			z.buf[8] = 2
 		} else if z.level == BestSpeed {
diff --git a/src/pkg/compress/gzip/gzip_test.go b/src/pkg/compress/gzip/gzip_test.go
index 121e627e6b2..815825be999 100644
--- a/src/pkg/compress/gzip/gzip_test.go
+++ b/src/pkg/compress/gzip/gzip_test.go
@@ -8,6 +8,7 @@ import (
 	"io"
 	"io/ioutil"
 	"testing"
+	"time"
 )
 
 // pipe creates two ends of a pipe that gzip and gunzip, and runs dfunc at the
@@ -53,7 +54,7 @@ func TestWriter(t *testing.T) {
 		func(compressor *Compressor) {
 			compressor.Comment = "comment"
 			compressor.Extra = []byte("extra")
-			compressor.Mtime = 1e8
+			compressor.ModTime = time.Unix(1e8, 0)
 			compressor.Name = "name"
 			_, err := compressor.Write([]byte("payload"))
 			if err != nil {
@@ -74,8 +75,8 @@ func TestWriter(t *testing.T) {
 			if string(decompressor.Extra) != "extra" {
 				t.Fatalf("extra is %q, want %q", decompressor.Extra, "extra")
 			}
-			if decompressor.Mtime != 1e8 {
-				t.Fatalf("mtime is %d, want %d", decompressor.Mtime, uint32(1e8))
+			if decompressor.ModTime.Unix() != 1e8 {
+				t.Fatalf("mtime is %d, want %d", decompressor.ModTime.Unix(), uint32(1e8))
 			}
 			if decompressor.Name != "name" {
 				t.Fatalf("name is %q, want %q", decompressor.Name, "name")
diff --git a/src/pkg/crypto/ocsp/ocsp.go b/src/pkg/crypto/ocsp/ocsp.go
index a04b5bd7135..aff7913b2fb 100644
--- a/src/pkg/crypto/ocsp/ocsp.go
+++ b/src/pkg/crypto/ocsp/ocsp.go
@@ -61,7 +61,7 @@ type responseData struct {
 	Version       int              `asn1:"optional,default:1,explicit,tag:0"`
 	RequestorName pkix.RDNSequence `asn1:"optional,explicit,tag:1"`
 	KeyHash       []byte           `asn1:"optional,explicit,tag:2"`
-	ProducedAt    *time.Time
+	ProducedAt    time.Time
 	Responses     []singleResponse
 }
 
@@ -70,12 +70,12 @@ type singleResponse struct {
 	Good       asn1.Flag   `asn1:"explicit,tag:0,optional"`
 	Revoked    revokedInfo `asn1:"explicit,tag:1,optional"`
 	Unknown    asn1.Flag   `asn1:"explicit,tag:2,optional"`
-	ThisUpdate *time.Time
-	NextUpdate *time.Time `asn1:"explicit,tag:0,optional"`
+	ThisUpdate time.Time
+	NextUpdate time.Time `asn1:"explicit,tag:0,optional"`
 }
 
 type revokedInfo struct {
-	RevocationTime *time.Time
+	RevocationTime time.Time
 	Reason         int `asn1:"explicit,tag:0,optional"`
 }
 
@@ -97,7 +97,7 @@ type Response struct {
 	// Status is one of {Good, Revoked, Unknown, ServerFailed}
 	Status                                        int
 	SerialNumber                                  []byte
-	ProducedAt, ThisUpdate, NextUpdate, RevokedAt *time.Time
+	ProducedAt, ThisUpdate, NextUpdate, RevokedAt time.Time
 	RevocationReason                              int
 	Certificate                                   *x509.Certificate
 }
diff --git a/src/pkg/crypto/ocsp/ocsp_test.go b/src/pkg/crypto/ocsp/ocsp_test.go
index 7be37211c10..bacca558b48 100644
--- a/src/pkg/crypto/ocsp/ocsp_test.go
+++ b/src/pkg/crypto/ocsp/ocsp_test.go
@@ -15,7 +15,13 @@ func TestOCSPDecode(t *testing.T) {
 		t.Error(err)
 	}
 
-	expected := Response{Status: 0, SerialNumber: []byte{0x1, 0xd0, 0xfa}, RevocationReason: 0, ThisUpdate: &time.Time{Year: 2010, Month: 7, Day: 7, Hour: 15, Minute: 1, Second: 5, ZoneOffset: 0, Zone: "UTC"}, NextUpdate: &time.Time{Year: 2010, Month: 7, Day: 7, Hour: 18, Minute: 35, Second: 17, ZoneOffset: 0, Zone: "UTC"}}
+	expected := Response{
+		Status:           0,
+		SerialNumber:     []byte{0x1, 0xd0, 0xfa},
+		RevocationReason: 0,
+		ThisUpdate:       time.Date(2010, 7, 7, 15, 1, 5, 0, time.UTC),
+		NextUpdate:       time.Date(2010, 7, 7, 18, 35, 17, 0, time.UTC),
+	}
 
 	if !reflect.DeepEqual(resp.ThisUpdate, resp.ThisUpdate) {
 		t.Errorf("resp.ThisUpdate: got %d, want %d", resp.ThisUpdate, expected.ThisUpdate)
diff --git a/src/pkg/crypto/openpgp/keys.go b/src/pkg/crypto/openpgp/keys.go
index b705d226e1f..df39970c0b6 100644
--- a/src/pkg/crypto/openpgp/keys.go
+++ b/src/pkg/crypto/openpgp/keys.go
@@ -381,7 +381,7 @@ const defaultRSAKeyBits = 2048
 // NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a
 // single identity composed of the given full name, comment and email, any of
 // which may be empty but must not contain any of "()<>\x00".
-func NewEntity(rand io.Reader, currentTimeSecs int64, name, comment, email string) (*Entity, error) {
+func NewEntity(rand io.Reader, currentTime time.Time, name, comment, email string) (*Entity, error) {
 	uid := packet.NewUserId(name, comment, email)
 	if uid == nil {
 		return nil, error_.InvalidArgumentError("user id field contained invalid characters")
@@ -395,11 +395,9 @@ func NewEntity(rand io.Reader, currentTimeSecs int64, name, comment, email strin
 		return nil, err
 	}
 
-	t := uint32(currentTimeSecs)
-
 	e := &Entity{
-		PrimaryKey: packet.NewRSAPublicKey(t, &signingPriv.PublicKey, false /* not a subkey */ ),
-		PrivateKey: packet.NewRSAPrivateKey(t, signingPriv, false /* not a subkey */ ),
+		PrimaryKey: packet.NewRSAPublicKey(currentTime, &signingPriv.PublicKey, false /* not a subkey */ ),
+		PrivateKey: packet.NewRSAPrivateKey(currentTime, signingPriv, false /* not a subkey */ ),
 		Identities: make(map[string]*Identity),
 	}
 	isPrimaryId := true
@@ -407,7 +405,7 @@ func NewEntity(rand io.Reader, currentTimeSecs int64, name, comment, email strin
 		Name:   uid.Name,
 		UserId: uid,
 		SelfSignature: &packet.Signature{
-			CreationTime: t,
+			CreationTime: currentTime,
 			SigType:      packet.SigTypePositiveCert,
 			PubKeyAlgo:   packet.PubKeyAlgoRSA,
 			Hash:         crypto.SHA256,
@@ -421,10 +419,10 @@ func NewEntity(rand io.Reader, currentTimeSecs int64, name, comment, email strin
 
 	e.Subkeys = make([]Subkey, 1)
 	e.Subkeys[0] = Subkey{
-		PublicKey:  packet.NewRSAPublicKey(t, &encryptingPriv.PublicKey, true /* is a subkey */ ),
-		PrivateKey: packet.NewRSAPrivateKey(t, encryptingPriv, true /* is a subkey */ ),
+		PublicKey:  packet.NewRSAPublicKey(currentTime, &encryptingPriv.PublicKey, true /* is a subkey */ ),
+		PrivateKey: packet.NewRSAPrivateKey(currentTime, encryptingPriv, true /* is a subkey */ ),
 		Sig: &packet.Signature{
-			CreationTime:              t,
+			CreationTime:              currentTime,
 			SigType:                   packet.SigTypeSubkeyBinding,
 			PubKeyAlgo:                packet.PubKeyAlgoRSA,
 			Hash:                      crypto.SHA256,
@@ -533,7 +531,7 @@ func (e *Entity) SignIdentity(identity string, signer *Entity) error {
 		SigType:      packet.SigTypeGenericCert,
 		PubKeyAlgo:   signer.PrivateKey.PubKeyAlgo,
 		Hash:         crypto.SHA256,
-		CreationTime: uint32(time.Seconds()),
+		CreationTime: time.Now(),
 		IssuerKeyId:  &signer.PrivateKey.KeyId,
 	}
 	if err := sig.SignKey(e.PrimaryKey, signer.PrivateKey); err != nil {
diff --git a/src/pkg/crypto/openpgp/packet/private_key.go b/src/pkg/crypto/openpgp/packet/private_key.go
index 5ef3db2a746..729e88d6860 100644
--- a/src/pkg/crypto/openpgp/packet/private_key.go
+++ b/src/pkg/crypto/openpgp/packet/private_key.go
@@ -17,6 +17,7 @@ import (
 	"io/ioutil"
 	"math/big"
 	"strconv"
+	"time"
 )
 
 // PrivateKey represents a possibly encrypted private key. See RFC 4880,
@@ -32,9 +33,9 @@ type PrivateKey struct {
 	iv            []byte
 }
 
-func NewRSAPrivateKey(currentTimeSecs uint32, priv *rsa.PrivateKey, isSubkey bool) *PrivateKey {
+func NewRSAPrivateKey(currentTime time.Time, priv *rsa.PrivateKey, isSubkey bool) *PrivateKey {
 	pk := new(PrivateKey)
-	pk.PublicKey = *NewRSAPublicKey(currentTimeSecs, &priv.PublicKey, isSubkey)
+	pk.PublicKey = *NewRSAPublicKey(currentTime, &priv.PublicKey, isSubkey)
 	pk.PrivateKey = priv
 	return pk
 }
diff --git a/src/pkg/crypto/openpgp/packet/private_key_test.go b/src/pkg/crypto/openpgp/packet/private_key_test.go
index 60eebaa6b09..35d8951a86b 100644
--- a/src/pkg/crypto/openpgp/packet/private_key_test.go
+++ b/src/pkg/crypto/openpgp/packet/private_key_test.go
@@ -6,19 +6,20 @@ package packet
 
 import (
 	"testing"
+	"time"
 )
 
 var privateKeyTests = []struct {
 	privateKeyHex string
-	creationTime  uint32
+	creationTime  time.Time
 }{
 	{
 		privKeyRSAHex,
-		0x4cc349a8,
+		time.Unix(0x4cc349a8, 0),
 	},
 	{
 		privKeyElGamalHex,
-		0x4df9ee1a,
+		time.Unix(0x4df9ee1a, 0),
 	},
 }
 
@@ -43,7 +44,7 @@ func TestPrivateKeyRead(t *testing.T) {
 			continue
 		}
 
-		if privKey.CreationTime != test.creationTime || privKey.Encrypted {
+		if !privKey.CreationTime.Equal(test.creationTime) || privKey.Encrypted {
 			t.Errorf("#%d: bad result, got: %#v", i, privKey)
 		}
 	}
diff --git a/src/pkg/crypto/openpgp/packet/public_key.go b/src/pkg/crypto/openpgp/packet/public_key.go
index 7d71dc49a7b..865313e5979 100644
--- a/src/pkg/crypto/openpgp/packet/public_key.go
+++ b/src/pkg/crypto/openpgp/packet/public_key.go
@@ -16,11 +16,12 @@ import (
 	"io"
 	"math/big"
 	"strconv"
+	"time"
 )
 
 // PublicKey represents an OpenPGP public key. See RFC 4880, section 5.5.2.
 type PublicKey struct {
-	CreationTime uint32 // seconds since the epoch
+	CreationTime time.Time
 	PubKeyAlgo   PublicKeyAlgorithm
 	PublicKey    interface{} // Either a *rsa.PublicKey or *dsa.PublicKey
 	Fingerprint  [20]byte
@@ -38,9 +39,9 @@ func fromBig(n *big.Int) parsedMPI {
 }
 
 // NewRSAPublicKey returns a PublicKey that wraps the given rsa.PublicKey.
-func NewRSAPublicKey(creationTimeSecs uint32, pub *rsa.PublicKey, isSubkey bool) *PublicKey {
+func NewRSAPublicKey(creationTime time.Time, pub *rsa.PublicKey, isSubkey bool) *PublicKey {
 	pk := &PublicKey{
-		CreationTime: creationTimeSecs,
+		CreationTime: creationTime,
 		PubKeyAlgo:   PubKeyAlgoRSA,
 		PublicKey:    pub,
 		IsSubkey:     isSubkey,
@@ -62,7 +63,7 @@ func (pk *PublicKey) parse(r io.Reader) (err error) {
 	if buf[0] != 4 {
 		return error_.UnsupportedError("public key version")
 	}
-	pk.CreationTime = uint32(buf[1])<<24 | uint32(buf[2])<<16 | uint32(buf[3])<<8 | uint32(buf[4])
+	pk.CreationTime = time.Unix(int64(uint32(buf[1])<<24|uint32(buf[2])<<16|uint32(buf[3])<<8|uint32(buf[4])), 0)
 	pk.PubKeyAlgo = PublicKeyAlgorithm(buf[5])
 	switch pk.PubKeyAlgo {
 	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
@@ -234,10 +235,11 @@ func (pk *PublicKey) Serialize(w io.Writer) (err error) {
 func (pk *PublicKey) serializeWithoutHeaders(w io.Writer) (err error) {
 	var buf [6]byte
 	buf[0] = 4
-	buf[1] = byte(pk.CreationTime >> 24)
-	buf[2] = byte(pk.CreationTime >> 16)
-	buf[3] = byte(pk.CreationTime >> 8)
-	buf[4] = byte(pk.CreationTime)
+	t := uint32(pk.CreationTime.Unix())
+	buf[1] = byte(t >> 24)
+	buf[2] = byte(t >> 16)
+	buf[3] = byte(t >> 8)
+	buf[4] = byte(t)
 	buf[5] = byte(pk.PubKeyAlgo)
 
 	_, err = w.Write(buf[:])
diff --git a/src/pkg/crypto/openpgp/packet/public_key_test.go b/src/pkg/crypto/openpgp/packet/public_key_test.go
index 6e8bfbce66e..72f459f47bf 100644
--- a/src/pkg/crypto/openpgp/packet/public_key_test.go
+++ b/src/pkg/crypto/openpgp/packet/public_key_test.go
@@ -8,19 +8,20 @@ import (
 	"bytes"
 	"encoding/hex"
 	"testing"
+	"time"
 )
 
 var pubKeyTests = []struct {
 	hexData        string
 	hexFingerprint string
-	creationTime   uint32
+	creationTime   time.Time
 	pubKeyAlgo     PublicKeyAlgorithm
 	keyId          uint64
 	keyIdString    string
 	keyIdShort     string
 }{
-	{rsaPkDataHex, rsaFingerprintHex, 0x4d3c5c10, PubKeyAlgoRSA, 0xa34d7e18c20c31bb, "A34D7E18C20C31BB", "C20C31BB"},
-	{dsaPkDataHex, dsaFingerprintHex, 0x4d432f89, PubKeyAlgoDSA, 0x8e8fbe54062f19ed, "8E8FBE54062F19ED", "062F19ED"},
+	{rsaPkDataHex, rsaFingerprintHex, time.Unix(0x4d3c5c10, 0), PubKeyAlgoRSA, 0xa34d7e18c20c31bb, "A34D7E18C20C31BB", "C20C31BB"},
+	{dsaPkDataHex, dsaFingerprintHex, time.Unix(0x4d432f89, 0), PubKeyAlgoDSA, 0x8e8fbe54062f19ed, "8E8FBE54062F19ED", "062F19ED"},
 }
 
 func TestPublicKeyRead(t *testing.T) {
@@ -38,8 +39,8 @@ func TestPublicKeyRead(t *testing.T) {
 		if pk.PubKeyAlgo != test.pubKeyAlgo {
 			t.Errorf("#%d: bad public key algorithm got:%x want:%x", i, pk.PubKeyAlgo, test.pubKeyAlgo)
 		}
-		if pk.CreationTime != test.creationTime {
-			t.Errorf("#%d: bad creation time got:%x want:%x", i, pk.CreationTime, test.creationTime)
+		if !pk.CreationTime.Equal(test.creationTime) {
+			t.Errorf("#%d: bad creation time got:%v want:%v", i, pk.CreationTime, test.creationTime)
 		}
 		expectedFingerprint, _ := hex.DecodeString(test.hexFingerprint)
 		if !bytes.Equal(expectedFingerprint, pk.Fingerprint[:]) {
diff --git a/src/pkg/crypto/openpgp/packet/signature.go b/src/pkg/crypto/openpgp/packet/signature.go
index 4ebb906cad7..f5bc8e86adb 100644
--- a/src/pkg/crypto/openpgp/packet/signature.go
+++ b/src/pkg/crypto/openpgp/packet/signature.go
@@ -15,6 +15,7 @@ import (
 	"hash"
 	"io"
 	"strconv"
+	"time"
 )
 
 // Signature represents a signature. See RFC 4880, section 5.2.
@@ -28,7 +29,7 @@ type Signature struct {
 	// HashTag contains the first two bytes of the hash for fast rejection
 	// of bad signed data.
 	HashTag      [2]byte
-	CreationTime uint32 // Unix epoch time
+	CreationTime time.Time
 
 	RSASignature     parsedMPI
 	DSASigR, DSASigS parsedMPI
@@ -151,7 +152,7 @@ func parseSignatureSubpackets(sig *Signature, subpackets []byte, isHashed bool)
 		}
 	}
 
-	if sig.CreationTime == 0 {
+	if sig.CreationTime.IsZero() {
 		err = error_.StructuralError("no creation time in signature")
 	}
 
@@ -223,7 +224,12 @@ func parseSignatureSubpacket(sig *Signature, subpacket []byte, isHashed bool) (r
 			err = error_.StructuralError("signature creation time not four bytes")
 			return
 		}
-		sig.CreationTime = binary.BigEndian.Uint32(subpacket)
+		t := binary.BigEndian.Uint32(subpacket)
+		if t == 0 {
+			sig.CreationTime = time.Time{}
+		} else {
+			sig.CreationTime = time.Unix(int64(t), 0)
+		}
 	case signatureExpirationSubpacket:
 		// Signature expiration time, section 5.2.3.10
 		if !isHashed {
@@ -541,10 +547,7 @@ type outputSubpacket struct {
 
 func (sig *Signature) buildSubpackets() (subpackets []outputSubpacket) {
 	creationTime := make([]byte, 4)
-	creationTime[0] = byte(sig.CreationTime >> 24)
-	creationTime[1] = byte(sig.CreationTime >> 16)
-	creationTime[2] = byte(sig.CreationTime >> 8)
-	creationTime[3] = byte(sig.CreationTime)
+	binary.BigEndian.PutUint32(creationTime, uint32(sig.CreationTime.Unix()))
 	subpackets = append(subpackets, outputSubpacket{true, creationTimeSubpacket, false, creationTime})
 
 	if sig.IssuerKeyId != nil {
diff --git a/src/pkg/crypto/openpgp/write.go b/src/pkg/crypto/openpgp/write.go
index 6f3450c9cdb..60dae01e64b 100644
--- a/src/pkg/crypto/openpgp/write.go
+++ b/src/pkg/crypto/openpgp/write.go
@@ -68,7 +68,7 @@ func detachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.S
 	sig.SigType = sigType
 	sig.PubKeyAlgo = signer.PrivateKey.PubKeyAlgo
 	sig.Hash = crypto.SHA256
-	sig.CreationTime = uint32(time.Seconds())
+	sig.CreationTime = time.Now()
 	sig.IssuerKeyId = &signer.PrivateKey.KeyId
 
 	h, wrappedHash, err := hashForSignature(sig.Hash, sig.SigType)
@@ -95,8 +95,8 @@ type FileHints struct {
 	// file should not be written to disk. It may be equal to "_CONSOLE" to
 	// suggest the data should not be written to disk.
 	FileName string
-	// EpochSeconds contains the modification time of the file, or 0 if not applicable.
-	EpochSeconds uint32
+	// ModTime contains the modification time of the file, or the zero time if not applicable.
+	ModTime time.Time
 }
 
 // SymmetricallyEncrypt acts like gpg -c: it encrypts a file with a passphrase.
@@ -115,7 +115,11 @@ func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHi
 	if err != nil {
 		return
 	}
-	return packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, hints.EpochSeconds)
+	var epochSeconds uint32
+	if !hints.ModTime.IsZero() {
+		epochSeconds = uint32(hints.ModTime.Unix())
+	}
+	return packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, epochSeconds)
 }
 
 // intersectPreferences mutates and returns a prefix of a that contains only
@@ -243,7 +247,11 @@ func Encrypt(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHint
 		w = noOpCloser{encryptedData}
 
 	}
-	literalData, err := packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, hints.EpochSeconds)
+	var epochSeconds uint32
+	if !hints.ModTime.IsZero() {
+		epochSeconds = uint32(hints.ModTime.Unix())
+	}
+	literalData, err := packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, epochSeconds)
 	if err != nil {
 		return nil, err
 	}
@@ -275,7 +283,7 @@ func (s signatureWriter) Close() error {
 		SigType:      packet.SigTypeBinary,
 		PubKeyAlgo:   s.signer.PubKeyAlgo,
 		Hash:         s.hashType,
-		CreationTime: uint32(time.Seconds()),
+		CreationTime: time.Now(),
 		IssuerKeyId:  &s.signer.KeyId,
 	}
 
diff --git a/src/pkg/crypto/openpgp/write_test.go b/src/pkg/crypto/openpgp/write_test.go
index 3cadf4cc95a..02fa5b75bff 100644
--- a/src/pkg/crypto/openpgp/write_test.go
+++ b/src/pkg/crypto/openpgp/write_test.go
@@ -54,7 +54,7 @@ func TestNewEntity(t *testing.T) {
 		return
 	}
 
-	e, err := NewEntity(rand.Reader, time.Seconds(), "Test User", "test", "test@example.com")
+	e, err := NewEntity(rand.Reader, time.Now(), "Test User", "test", "test@example.com")
 	if err != nil {
 		t.Errorf("failed to create entity: %s", err)
 		return
diff --git a/src/pkg/crypto/rand/rand_unix.go b/src/pkg/crypto/rand/rand_unix.go
index 09442ad2830..d9cddf6d2ad 100644
--- a/src/pkg/crypto/rand/rand_unix.go
+++ b/src/pkg/crypto/rand/rand_unix.go
@@ -100,7 +100,7 @@ func (r *reader) Read(b []byte) (n int, err error) {
 		// t = encrypt(time)
 		// dst = encrypt(t^seed)
 		// seed = encrypt(t^dst)
-		ns := time.Nanoseconds()
+		ns := time.Now().UnixNano()
 		r.time[0] = byte(ns >> 56)
 		r.time[1] = byte(ns >> 48)
 		r.time[2] = byte(ns >> 40)
diff --git a/src/pkg/crypto/tls/common.go b/src/pkg/crypto/tls/common.go
index e9042486828..f57d932a98f 100644
--- a/src/pkg/crypto/tls/common.go
+++ b/src/pkg/crypto/tls/common.go
@@ -121,7 +121,7 @@ type Config struct {
 
 	// Time returns the current time as the number of seconds since the epoch.
 	// If Time is nil, TLS uses the system time.Seconds.
-	Time func() int64
+	Time func() time.Time
 
 	// Certificates contains one or more certificate chains
 	// to present to the other side of the connection.
@@ -175,10 +175,10 @@ func (c *Config) rand() io.Reader {
 	return r
 }
 
-func (c *Config) time() int64 {
+func (c *Config) time() time.Time {
 	t := c.Time
 	if t == nil {
-		t = time.Seconds
+		t = time.Now
 	}
 	return t()
 }
diff --git a/src/pkg/crypto/tls/handshake_client.go b/src/pkg/crypto/tls/handshake_client.go
index 0f41008bf43..5559c7a22d4 100644
--- a/src/pkg/crypto/tls/handshake_client.go
+++ b/src/pkg/crypto/tls/handshake_client.go
@@ -32,7 +32,7 @@ func (c *Conn) clientHandshake() error {
 		nextProtoNeg:       len(c.config.NextProtos) > 0,
 	}
 
-	t := uint32(c.config.time())
+	t := uint32(c.config.time().Unix())
 	hello.random[0] = byte(t >> 24)
 	hello.random[1] = byte(t >> 16)
 	hello.random[2] = byte(t >> 8)
diff --git a/src/pkg/crypto/tls/handshake_server.go b/src/pkg/crypto/tls/handshake_server.go
index 1fa4585189a..11ea500fc70 100644
--- a/src/pkg/crypto/tls/handshake_server.go
+++ b/src/pkg/crypto/tls/handshake_server.go
@@ -95,7 +95,7 @@ FindCipherSuite:
 
 	hello.vers = vers
 	hello.cipherSuite = suite.id
-	t := uint32(config.time())
+	t := uint32(config.time().Unix())
 	hello.random = make([]byte, 32)
 	hello.random[0] = byte(t >> 24)
 	hello.random[1] = byte(t >> 16)
diff --git a/src/pkg/crypto/tls/handshake_server_test.go b/src/pkg/crypto/tls/handshake_server_test.go
index bc3797947f5..e00c32c5508 100644
--- a/src/pkg/crypto/tls/handshake_server_test.go
+++ b/src/pkg/crypto/tls/handshake_server_test.go
@@ -15,6 +15,7 @@ import (
 	"strconv"
 	"strings"
 	"testing"
+	"time"
 )
 
 type zeroSource struct{}
@@ -31,7 +32,7 @@ var testConfig *Config
 
 func init() {
 	testConfig = new(Config)
-	testConfig.Time = func() int64 { return 0 }
+	testConfig.Time = func() time.Time { return time.Unix(0, 0) }
 	testConfig.Rand = zeroSource{}
 	testConfig.Certificates = make([]Certificate, 1)
 	testConfig.Certificates[0].Certificate = [][]byte{testCertificate}
diff --git a/src/pkg/crypto/x509/pkix/pkix.go b/src/pkg/crypto/x509/pkix/pkix.go
index b35274c9ae1..8eced55f932 100644
--- a/src/pkg/crypto/x509/pkix/pkix.go
+++ b/src/pkg/crypto/x509/pkix/pkix.go
@@ -142,10 +142,9 @@ type CertificateList struct {
 	SignatureValue     asn1.BitString
 }
 
-// HasExpired returns true iff currentTimeSeconds is past the expiry time of
-// certList.
-func (certList *CertificateList) HasExpired(currentTimeSeconds int64) bool {
-	return certList.TBSCertList.NextUpdate.Seconds() <= currentTimeSeconds
+// HasExpired returns true iff now is past the expiry time of certList.
+func (certList *CertificateList) HasExpired(now time.Time) bool {
+	return now.After(certList.TBSCertList.NextUpdate)
 }
 
 // TBSCertificateList represents the ASN.1 structure of the same name. See RFC
@@ -155,8 +154,8 @@ type TBSCertificateList struct {
 	Version             int `asn1:"optional,default:2"`
 	Signature           AlgorithmIdentifier
 	Issuer              RDNSequence
-	ThisUpdate          *time.Time
-	NextUpdate          *time.Time
+	ThisUpdate          time.Time
+	NextUpdate          time.Time
 	RevokedCertificates []RevokedCertificate `asn1:"optional"`
 	Extensions          []Extension          `asn1:"tag:0,optional,explicit"`
 }
@@ -165,6 +164,6 @@ type TBSCertificateList struct {
 // 5280, section 5.1.
 type RevokedCertificate struct {
 	SerialNumber   *big.Int
-	RevocationTime *time.Time
+	RevocationTime time.Time
 	Extensions     []Extension `asn1:"optional"`
 }
diff --git a/src/pkg/crypto/x509/verify.go b/src/pkg/crypto/x509/verify.go
index 3021d20a67f..50a3b66e555 100644
--- a/src/pkg/crypto/x509/verify.go
+++ b/src/pkg/crypto/x509/verify.go
@@ -76,7 +76,7 @@ type VerifyOptions struct {
 	DNSName       string
 	Intermediates *CertPool
 	Roots         *CertPool
-	CurrentTime   int64 // if 0, the current system time is used.
+	CurrentTime   time.Time // if zero, the current time is used
 }
 
 const (
@@ -87,8 +87,11 @@ const (
 
 // isValid performs validity checks on the c.
 func (c *Certificate) isValid(certType int, opts *VerifyOptions) error {
-	if opts.CurrentTime < c.NotBefore.Seconds() ||
-		opts.CurrentTime > c.NotAfter.Seconds() {
+	now := opts.CurrentTime
+	if now.IsZero() {
+		now = time.Now()
+	}
+	if now.Before(c.NotBefore) || now.After(c.NotAfter) {
 		return CertificateInvalidError{c, Expired}
 	}
 
@@ -136,9 +139,6 @@ func (c *Certificate) isValid(certType int, opts *VerifyOptions) error {
 //
 // WARNING: this doesn't do any revocation checking.
 func (c *Certificate) Verify(opts VerifyOptions) (chains [][]*Certificate, err error) {
-	if opts.CurrentTime == 0 {
-		opts.CurrentTime = time.Seconds()
-	}
 	err = c.isValid(leafCertificate, &opts)
 	if err != nil {
 		return
diff --git a/src/pkg/crypto/x509/verify_test.go b/src/pkg/crypto/x509/verify_test.go
index 2194d15bc88..df5443023ff 100644
--- a/src/pkg/crypto/x509/verify_test.go
+++ b/src/pkg/crypto/x509/verify_test.go
@@ -10,6 +10,7 @@ import (
 	"errors"
 	"strings"
 	"testing"
+	"time"
 )
 
 type verifyTest struct {
@@ -133,7 +134,7 @@ func TestVerify(t *testing.T) {
 			Roots:         NewCertPool(),
 			Intermediates: NewCertPool(),
 			DNSName:       test.dnsName,
-			CurrentTime:   test.currentTime,
+			CurrentTime:   time.Unix(test.currentTime, 0),
 		}
 
 		for j, root := range test.roots {
diff --git a/src/pkg/crypto/x509/x509.go b/src/pkg/crypto/x509/x509.go
index a5f5d8d4056..d64723a1563 100644
--- a/src/pkg/crypto/x509/x509.go
+++ b/src/pkg/crypto/x509/x509.go
@@ -107,7 +107,7 @@ type dsaSignature struct {
 }
 
 type validity struct {
-	NotBefore, NotAfter *time.Time
+	NotBefore, NotAfter time.Time
 }
 
 type publicKeyInfo struct {
@@ -303,7 +303,7 @@ type Certificate struct {
 	SerialNumber        *big.Int
 	Issuer              pkix.Name
 	Subject             pkix.Name
-	NotBefore, NotAfter *time.Time // Validity bounds.
+	NotBefore, NotAfter time.Time // Validity bounds.
 	KeyUsage            KeyUsage
 
 	ExtKeyUsage        []ExtKeyUsage           // Sequence of extended key usages.
@@ -1005,7 +1005,7 @@ func ParseDERCRL(derBytes []byte) (certList *pkix.CertificateList, err error) {
 
 // CreateCRL returns a DER encoded CRL, signed by this Certificate, that
 // contains the given list of revoked certificates.
-func (c *Certificate) CreateCRL(rand io.Reader, priv *rsa.PrivateKey, revokedCerts []pkix.RevokedCertificate, now, expiry *time.Time) (crlBytes []byte, err error) {
+func (c *Certificate) CreateCRL(rand io.Reader, priv *rsa.PrivateKey, revokedCerts []pkix.RevokedCertificate, now, expiry time.Time) (crlBytes []byte, err error) {
 	tbsCertList := pkix.TBSCertificateList{
 		Version: 2,
 		Signature: pkix.AlgorithmIdentifier{
diff --git a/src/pkg/crypto/x509/x509_test.go b/src/pkg/crypto/x509/x509_test.go
index c42471507be..f0327b0124d 100644
--- a/src/pkg/crypto/x509/x509_test.go
+++ b/src/pkg/crypto/x509/x509_test.go
@@ -250,8 +250,8 @@ func TestCreateSelfSignedCertificate(t *testing.T) {
 			CommonName:   commonName,
 			Organization: []string{"Acme Co"},
 		},
-		NotBefore: time.SecondsToUTC(1000),
-		NotAfter:  time.SecondsToUTC(100000),
+		NotBefore: time.Unix(1000, 0),
+		NotAfter:  time.Unix(100000, 0),
 
 		SubjectKeyId: []byte{1, 2, 3, 4},
 		KeyUsage:     KeyUsageCertSign,
@@ -396,8 +396,8 @@ func TestCRLCreation(t *testing.T) {
 	block, _ = pem.Decode([]byte(pemCertificate))
 	cert, _ := ParseCertificate(block.Bytes)
 
-	now := time.SecondsToUTC(1000)
-	expiry := time.SecondsToUTC(10000)
+	now := time.Unix(1000, 0)
+	expiry := time.Unix(10000, 0)
 
 	revokedCerts := []pkix.RevokedCertificate{
 		{
@@ -443,7 +443,7 @@ func TestParseDERCRL(t *testing.T) {
 		t.Errorf("bad number of revoked certificates. got: %d want: %d", numCerts, expected)
 	}
 
-	if certList.HasExpired(1302517272) {
+	if certList.HasExpired(time.Unix(1302517272, 0)) {
 		t.Errorf("CRL has expired (but shouldn't have)")
 	}
 
@@ -463,7 +463,7 @@ func TestParsePEMCRL(t *testing.T) {
 		t.Errorf("bad number of revoked certificates. got: %d want: %d", numCerts, expected)
 	}
 
-	if certList.HasExpired(1302517272) {
+	if certList.HasExpired(time.Unix(1302517272, 0)) {
 		t.Errorf("CRL has expired (but shouldn't have)")
 	}
 
diff --git a/src/pkg/encoding/asn1/asn1.go b/src/pkg/encoding/asn1/asn1.go
index a0066654f8d..22a0dde0da4 100644
--- a/src/pkg/encoding/asn1/asn1.go
+++ b/src/pkg/encoding/asn1/asn1.go
@@ -247,7 +247,7 @@ func parseBase128Int(bytes []byte, initOffset int) (ret, offset int, err error)
 
 // UTCTime
 
-func parseUTCTime(bytes []byte) (ret *time.Time, err error) {
+func parseUTCTime(bytes []byte) (ret time.Time, err error) {
 	s := string(bytes)
 	ret, err = time.Parse("0601021504Z0700", s)
 	if err == nil {
@@ -259,7 +259,7 @@ func parseUTCTime(bytes []byte) (ret *time.Time, err error) {
 
 // parseGeneralizedTime parses the GeneralizedTime from the given byte slice
 // and returns the resulting time.
-func parseGeneralizedTime(bytes []byte) (ret *time.Time, err error) {
+func parseGeneralizedTime(bytes []byte) (ret time.Time, err error) {
 	return time.Parse("20060102150405Z0700", string(bytes))
 }
 
@@ -450,7 +450,7 @@ var (
 	objectIdentifierType = reflect.TypeOf(ObjectIdentifier{})
 	enumeratedType       = reflect.TypeOf(Enumerated(0))
 	flagType             = reflect.TypeOf(Flag(false))
-	timeType             = reflect.TypeOf(&time.Time{})
+	timeType             = reflect.TypeOf(time.Time{})
 	rawValueType         = reflect.TypeOf(RawValue{})
 	rawContentsType      = reflect.TypeOf(RawContent(nil))
 	bigIntType           = reflect.TypeOf(new(big.Int))
@@ -647,7 +647,7 @@ func parseField(v reflect.Value, bytes []byte, initOffset int, params fieldParam
 		err = err1
 		return
 	case timeType:
-		var time *time.Time
+		var time time.Time
 		var err1 error
 		if universalTag == tagUTCTime {
 			time, err1 = parseUTCTime(innerBytes)
@@ -799,7 +799,7 @@ func setDefaultValue(v reflect.Value, params fieldParameters) (ok bool) {
 //
 // An ASN.1 ENUMERATED can be written to an Enumerated.
 //
-// An ASN.1 UTCTIME or GENERALIZEDTIME can be written to a *time.Time.
+// An ASN.1 UTCTIME or GENERALIZEDTIME can be written to a time.Time.
 //
 // An ASN.1 PrintableString or IA5String can be written to a string.
 //
diff --git a/src/pkg/encoding/asn1/asn1_test.go b/src/pkg/encoding/asn1/asn1_test.go
index 1c529bdb30c..ea1906a7b65 100644
--- a/src/pkg/encoding/asn1/asn1_test.go
+++ b/src/pkg/encoding/asn1/asn1_test.go
@@ -202,22 +202,22 @@ func TestObjectIdentifier(t *testing.T) {
 type timeTest struct {
 	in  string
 	ok  bool
-	out *time.Time
+	out time.Time
 }
 
 var utcTestData = []timeTest{
-	{"910506164540-0700", true, &time.Time{1991, 05, 06, 16, 45, 40, 0, -7 * 60 * 60, ""}},
-	{"910506164540+0730", true, &time.Time{1991, 05, 06, 16, 45, 40, 0, 7*60*60 + 30*60, ""}},
-	{"910506234540Z", true, &time.Time{1991, 05, 06, 23, 45, 40, 0, 0, "UTC"}},
-	{"9105062345Z", true, &time.Time{1991, 05, 06, 23, 45, 0, 0, 0, "UTC"}},
-	{"a10506234540Z", false, nil},
-	{"91a506234540Z", false, nil},
-	{"9105a6234540Z", false, nil},
-	{"910506a34540Z", false, nil},
-	{"910506334a40Z", false, nil},
-	{"91050633444aZ", false, nil},
-	{"910506334461Z", false, nil},
-	{"910506334400Za", false, nil},
+	{"910506164540-0700", true, time.Date(1991, 05, 06, 16, 45, 40, 0, time.FixedZone("", -7*60*60))},
+	{"910506164540+0730", true, time.Date(1991, 05, 06, 16, 45, 40, 0, time.FixedZone("", 7*60*60+30*60))},
+	{"910506234540Z", true, time.Date(1991, 05, 06, 23, 45, 40, 0, time.UTC)},
+	{"9105062345Z", true, time.Date(1991, 05, 06, 23, 45, 0, 0, time.UTC)},
+	{"a10506234540Z", false, time.Time{}},
+	{"91a506234540Z", false, time.Time{}},
+	{"9105a6234540Z", false, time.Time{}},
+	{"910506a34540Z", false, time.Time{}},
+	{"910506334a40Z", false, time.Time{}},
+	{"91050633444aZ", false, time.Time{}},
+	{"910506334461Z", false, time.Time{}},
+	{"910506334400Za", false, time.Time{}},
 }
 
 func TestUTCTime(t *testing.T) {
@@ -235,10 +235,10 @@ func TestUTCTime(t *testing.T) {
 }
 
 var generalizedTimeTestData = []timeTest{
-	{"20100102030405Z", true, &time.Time{2010, 01, 02, 03, 04, 05, 0, 0, "UTC"}},
-	{"20100102030405", false, nil},
-	{"20100102030405+0607", true, &time.Time{2010, 01, 02, 03, 04, 05, 0, 6*60*60 + 7*60, ""}},
-	{"20100102030405-0607", true, &time.Time{2010, 01, 02, 03, 04, 05, 0, -6*60*60 - 7*60, ""}},
+	{"20100102030405Z", true, time.Date(2010, 01, 02, 03, 04, 05, 0, time.UTC)},
+	{"20100102030405", false, time.Time{}},
+	{"20100102030405+0607", true, time.Date(2010, 01, 02, 03, 04, 05, 0, time.FixedZone("", 6*60*60+7*60))},
+	{"20100102030405-0607", true, time.Date(2010, 01, 02, 03, 04, 05, 0, time.FixedZone("", -6*60*60-7*60))},
 }
 
 func TestGeneralizedTime(t *testing.T) {
@@ -407,7 +407,7 @@ type AttributeTypeAndValue struct {
 }
 
 type Validity struct {
-	NotBefore, NotAfter *time.Time
+	NotBefore, NotAfter time.Time
 }
 
 type PublicKeyInfo struct {
@@ -475,7 +475,10 @@ var derEncodedSelfSignedCert = Certificate{
 			RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 3}, Value: "false.example.com"}},
 			RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{1, 2, 840, 113549, 1, 9, 1}, Value: "false@example.com"}},
 		},
-		Validity: Validity{NotBefore: &time.Time{Year: 2009, Month: 10, Day: 8, Hour: 0, Minute: 25, Second: 53, ZoneOffset: 0, Zone: "UTC"}, NotAfter: &time.Time{Year: 2010, Month: 10, Day: 8, Hour: 0, Minute: 25, Second: 53, ZoneOffset: 0, Zone: "UTC"}},
+		Validity: Validity{
+			NotBefore: time.Date(2009, 10, 8, 00, 25, 53, 0, time.UTC),
+			NotAfter:  time.Date(2010, 10, 8, 00, 25, 53, 0, time.UTC),
+		},
 		Subject: RDNSequence{
 			RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 6}, Value: "XX"}},
 			RelativeDistinguishedNameSET{AttributeTypeAndValue{Type: ObjectIdentifier{2, 5, 4, 8}, Value: "Some-State"}},
diff --git a/src/pkg/encoding/asn1/marshal.go b/src/pkg/encoding/asn1/marshal.go
index 89c50a70ef4..c181e43f979 100644
--- a/src/pkg/encoding/asn1/marshal.go
+++ b/src/pkg/encoding/asn1/marshal.go
@@ -288,52 +288,58 @@ func marshalTwoDigits(out *forkableWriter, v int) (err error) {
 	return out.WriteByte(byte('0' + v%10))
 }
 
-func marshalUTCTime(out *forkableWriter, t *time.Time) (err error) {
+func marshalUTCTime(out *forkableWriter, t time.Time) (err error) {
+	utc := t.UTC()
+	year, month, day := utc.Date()
+
 	switch {
-	case 1950 <= t.Year && t.Year < 2000:
-		err = marshalTwoDigits(out, int(t.Year-1900))
-	case 2000 <= t.Year && t.Year < 2050:
-		err = marshalTwoDigits(out, int(t.Year-2000))
+	case 1950 <= year && year < 2000:
+		err = marshalTwoDigits(out, int(year-1900))
+	case 2000 <= year && year < 2050:
+		err = marshalTwoDigits(out, int(year-2000))
 	default:
 		return StructuralError{"Cannot represent time as UTCTime"}
 	}
-
 	if err != nil {
 		return
 	}
 
-	err = marshalTwoDigits(out, t.Month)
+	err = marshalTwoDigits(out, int(month))
 	if err != nil {
 		return
 	}
 
-	err = marshalTwoDigits(out, t.Day)
+	err = marshalTwoDigits(out, day)
 	if err != nil {
 		return
 	}
 
-	err = marshalTwoDigits(out, t.Hour)
+	hour, min, sec := utc.Clock()
+
+	err = marshalTwoDigits(out, hour)
 	if err != nil {
 		return
 	}
 
-	err = marshalTwoDigits(out, t.Minute)
+	err = marshalTwoDigits(out, min)
 	if err != nil {
 		return
 	}
 
-	err = marshalTwoDigits(out, t.Second)
+	err = marshalTwoDigits(out, sec)
 	if err != nil {
 		return
 	}
 
+	_, offset := t.Zone()
+
 	switch {
-	case t.ZoneOffset/60 == 0:
+	case offset/60 == 0:
 		err = out.WriteByte('Z')
 		return
-	case t.ZoneOffset > 0:
+	case offset > 0:
 		err = out.WriteByte('+')
-	case t.ZoneOffset < 0:
+	case offset < 0:
 		err = out.WriteByte('-')
 	}
 
@@ -341,7 +347,7 @@ func marshalUTCTime(out *forkableWriter, t *time.Time) (err error) {
 		return
 	}
 
-	offsetMinutes := t.ZoneOffset / 60
+	offsetMinutes := offset / 60
 	if offsetMinutes < 0 {
 		offsetMinutes = -offsetMinutes
 	}
@@ -366,7 +372,7 @@ func stripTagAndLength(in []byte) []byte {
 func marshalBody(out *forkableWriter, value reflect.Value, params fieldParameters) (err error) {
 	switch value.Type() {
 	case timeType:
-		return marshalUTCTime(out, value.Interface().(*time.Time))
+		return marshalUTCTime(out, value.Interface().(time.Time))
 	case bitStringType:
 		return marshalBitString(out, value.Interface().(BitString))
 	case objectIdentifierType:
diff --git a/src/pkg/encoding/asn1/marshal_test.go b/src/pkg/encoding/asn1/marshal_test.go
index 03df5f1e1d5..d05b5d8d4e9 100644
--- a/src/pkg/encoding/asn1/marshal_test.go
+++ b/src/pkg/encoding/asn1/marshal_test.go
@@ -51,10 +51,7 @@ type optionalRawValueTest struct {
 
 type testSET []int
 
-func setPST(t *time.Time) *time.Time {
-	t.ZoneOffset = -28800
-	return t
-}
+var PST = time.FixedZone("PST", -8*60*60)
 
 type marshalTest struct {
 	in  interface{}
@@ -73,9 +70,9 @@ var marshalTests = []marshalTest{
 	{[]byte{1, 2, 3}, "0403010203"},
 	{implicitTagTest{64}, "3003850140"},
 	{explicitTagTest{64}, "3005a503020140"},
-	{time.SecondsToUTC(0), "170d3730303130313030303030305a"},
-	{time.SecondsToUTC(1258325776), "170d3039313131353232353631365a"},
-	{setPST(time.SecondsToUTC(1258325776)), "17113039313131353232353631362d30383030"},
+	{time.Unix(0, 0).UTC(), "170d3730303130313030303030305a"},
+	{time.Unix(1258325776, 0).UTC(), "170d3039313131353232353631365a"},
+	{time.Unix(1258325776, 0).In(PST), "17113039313131353232353631362d30383030"},
 	{BitString{[]byte{0x80}, 1}, "03020780"},
 	{BitString{[]byte{0x81, 0xf0}, 12}, "03030481f0"},
 	{ObjectIdentifier([]int{1, 2, 3, 4}), "06032a0304"},
@@ -123,7 +120,8 @@ func TestMarshal(t *testing.T) {
 		}
 		out, _ := hex.DecodeString(test.out)
 		if bytes.Compare(out, data) != 0 {
-			t.Errorf("#%d got: %x want %x", i, data, out)
+			t.Errorf("#%d got: %x want %x\n\t%q\n\t%q", i, data, out, data, out)
+
 		}
 	}
 }
diff --git a/src/pkg/exp/types/gcimporter_test.go b/src/pkg/exp/types/gcimporter_test.go
index 3f66d226153..adac072f852 100644
--- a/src/pkg/exp/types/gcimporter_test.go
+++ b/src/pkg/exp/types/gcimporter_test.go
@@ -58,16 +58,16 @@ func testPath(t *testing.T, path string) bool {
 	return true
 }
 
-const maxTime = 3e9 // maximum allotted testing time in ns
+const maxTime = 3 * time.Second
 
-func testDir(t *testing.T, dir string, endTime int64) (nimports int) {
+func testDir(t *testing.T, dir string, endTime time.Time) (nimports int) {
 	dirname := filepath.Join(pkgRoot, dir)
 	list, err := ioutil.ReadDir(dirname)
 	if err != nil {
 		t.Errorf("testDir(%s): %s", dirname, err)
 	}
 	for _, f := range list {
-		if time.Nanoseconds() >= endTime {
+		if time.Now().After(endTime) {
 			t.Log("testing time used up")
 			return
 		}
@@ -96,6 +96,6 @@ func TestGcImport(t *testing.T) {
 	if testPath(t, "./testdata/exports") {
 		nimports++
 	}
-	nimports += testDir(t, "", time.Nanoseconds()+maxTime) // installed packages
+	nimports += testDir(t, "", time.Now().Add(maxTime)) // installed packages
 	t.Logf("tested %d imports", nimports)
 }
diff --git a/src/pkg/go/build/build.go b/src/pkg/go/build/build.go
index e3de8d0fa7f..9b3ab02d1d1 100644
--- a/src/pkg/go/build/build.go
+++ b/src/pkg/go/build/build.go
@@ -15,6 +15,7 @@ import (
 	"regexp"
 	"runtime"
 	"strings"
+	"time"
 )
 
 // Build produces a build Script for the given package.
@@ -150,7 +151,7 @@ func (s *Script) Run() error {
 
 // Stale returns true if the build's inputs are newer than its outputs.
 func (s *Script) Stale() bool {
-	var latest int64
+	var latest time.Time
 	// get latest mtime of outputs
 	for _, file := range s.Output {
 		fi, err := os.Stat(file)
@@ -158,13 +159,13 @@ func (s *Script) Stale() bool {
 			// any error reading output files means stale
 			return true
 		}
-		if m := fi.Mtime_ns; m > latest {
-			latest = m
+		if fi.ModTime.After(latest) {
+			latest = fi.ModTime
 		}
 	}
 	for _, file := range s.Input {
 		fi, err := os.Stat(file)
-		if err != nil || fi.Mtime_ns > latest {
+		if err != nil || fi.ModTime.After(latest) {
 			// any error reading input files means stale
 			// (attempt to rebuild to figure out why)
 			return true
diff --git a/src/pkg/io/ioutil/tempfile.go b/src/pkg/io/ioutil/tempfile.go
index 71028e22677..645eed6abb8 100644
--- a/src/pkg/io/ioutil/tempfile.go
+++ b/src/pkg/io/ioutil/tempfile.go
@@ -18,7 +18,7 @@ import (
 var rand uint32
 
 func reseed() uint32 {
-	return uint32(time.Nanoseconds() + int64(os.Getpid()))
+	return uint32(time.Now().UnixNano() + int64(os.Getpid()))
 }
 
 func nextSuffix() string {
diff --git a/src/pkg/log/log.go b/src/pkg/log/log.go
index b5368af5319..a5d88fd9b34 100644
--- a/src/pkg/log/log.go
+++ b/src/pkg/log/log.go
@@ -83,27 +83,28 @@ func itoa(buf *bytes.Buffer, i int, wid int) {
 	}
 }
 
-func (l *Logger) formatHeader(buf *bytes.Buffer, ns int64, file string, line int) {
+func (l *Logger) formatHeader(buf *bytes.Buffer, t time.Time, file string, line int) {
 	buf.WriteString(l.prefix)
 	if l.flag&(Ldate|Ltime|Lmicroseconds) != 0 {
-		t := time.SecondsToLocalTime(ns / 1e9)
 		if l.flag&Ldate != 0 {
-			itoa(buf, int(t.Year), 4)
+			year, month, day := t.Date()
+			itoa(buf, year, 4)
 			buf.WriteByte('/')
-			itoa(buf, int(t.Month), 2)
+			itoa(buf, int(month), 2)
 			buf.WriteByte('/')
-			itoa(buf, int(t.Day), 2)
+			itoa(buf, day, 2)
 			buf.WriteByte(' ')
 		}
 		if l.flag&(Ltime|Lmicroseconds) != 0 {
-			itoa(buf, int(t.Hour), 2)
+			hour, min, sec := t.Clock()
+			itoa(buf, hour, 2)
 			buf.WriteByte(':')
-			itoa(buf, int(t.Minute), 2)
+			itoa(buf, min, 2)
 			buf.WriteByte(':')
-			itoa(buf, int(t.Second), 2)
+			itoa(buf, sec, 2)
 			if l.flag&Lmicroseconds != 0 {
 				buf.WriteByte('.')
-				itoa(buf, int(ns%1e9)/1e3, 6)
+				itoa(buf, t.Nanosecond()/1e3, 6)
 			}
 			buf.WriteByte(' ')
 		}
@@ -133,7 +134,7 @@ func (l *Logger) formatHeader(buf *bytes.Buffer, ns int64, file string, line int
 // provided for generality, although at the moment on all pre-defined
 // paths it will be 2.
 func (l *Logger) Output(calldepth int, s string) error {
-	now := time.Nanoseconds() // get this early.
+	now := time.Now() // get this early.
 	var file string
 	var line int
 	l.mu.Lock()
diff --git a/src/pkg/math/big/calibrate_test.go b/src/pkg/math/big/calibrate_test.go
index 1cd93b1052b..0950eeedbd2 100644
--- a/src/pkg/math/big/calibrate_test.go
+++ b/src/pkg/math/big/calibrate_test.go
@@ -22,14 +22,14 @@ import (
 var calibrate = flag.Bool("calibrate", false, "run calibration test")
 
 // measure returns the time to run f
-func measure(f func()) int64 {
+func measure(f func()) time.Duration {
 	const N = 100
-	start := time.Nanoseconds()
+	start := time.Now()
 	for i := N; i > 0; i-- {
 		f()
 	}
-	stop := time.Nanoseconds()
-	return (stop - start) / N
+	stop := time.Now()
+	return stop.Sub(start) / N
 }
 
 func computeThresholds() {
@@ -46,7 +46,7 @@ func computeThresholds() {
 	th1 := -1
 	th2 := -1
 
-	var deltaOld int64
+	var deltaOld time.Duration
 	for count := -1; count != 0; count-- {
 		// determine Tk, the work load execution time using Karatsuba multiplication
 		karatsubaThreshold = n // enable karatsuba
diff --git a/src/pkg/net/dnsclient_unix.go b/src/pkg/net/dnsclient_unix.go
index bab5f2a9b6e..79a958e3cd0 100644
--- a/src/pkg/net/dnsclient_unix.go
+++ b/src/pkg/net/dnsclient_unix.go
@@ -29,7 +29,7 @@ func exchange(cfg *dnsConfig, c Conn, name string, qtype uint16) (*dnsMsg, error
 		return nil, &DNSError{Err: "name too long", Name: name}
 	}
 	out := new(dnsMsg)
-	out.id = uint16(rand.Int()) ^ uint16(time.Nanoseconds())
+	out.id = uint16(rand.Int()) ^ uint16(time.Now().UnixNano())
 	out.question = []dnsQuestion{
 		{name, qtype, dnsClassINET},
 	}
diff --git a/src/pkg/net/fd.go b/src/pkg/net/fd.go
index 70e04a21c0b..5318c51c9a2 100644
--- a/src/pkg/net/fd.go
+++ b/src/pkg/net/fd.go
@@ -171,7 +171,7 @@ func (s *pollServer) WakeFD(fd *netFD, mode int) {
 }
 
 func (s *pollServer) Now() int64 {
-	return time.Nanoseconds()
+	return time.Now().UnixNano()
 }
 
 func (s *pollServer) CheckDeadlines() {
diff --git a/src/pkg/net/fd_windows.go b/src/pkg/net/fd_windows.go
index 7a1602371e9..264b918c57d 100644
--- a/src/pkg/net/fd_windows.go
+++ b/src/pkg/net/fd_windows.go
@@ -172,11 +172,12 @@ func (s *ioSrv) ExecIO(oi anOpIface, deadline_delta int64) (n int, err error) {
 		return 0, &OpError{oi.Name(), o.fd.net, o.fd.laddr, e}
 	}
 	// Wait for our request to complete.
+	// TODO(rsc): This should stop the timer.
 	var r ioResult
 	if deadline_delta > 0 {
 		select {
 		case r = <-o.resultc:
-		case <-time.After(deadline_delta):
+		case <-time.After(time.Duration(deadline_delta) * time.Nanosecond):
 			s.canchan <- oi
 			<-o.errnoc
 			r = <-o.resultc
diff --git a/src/pkg/net/hosts.go b/src/pkg/net/hosts.go
index ddfb074ee8f..e6674ba3415 100644
--- a/src/pkg/net/hosts.go
+++ b/src/pkg/net/hosts.go
@@ -11,7 +11,7 @@ import (
 	"time"
 )
 
-const cacheMaxAge = int64(300) // 5 minutes.
+const cacheMaxAge = 5 * time.Minute
 
 // hostsPath points to the file with static IP/address entries.
 var hostsPath = "/etc/hosts"
@@ -21,14 +21,14 @@ var hosts struct {
 	sync.Mutex
 	byName map[string][]string
 	byAddr map[string][]string
-	time   int64
+	expire time.Time
 	path   string
 }
 
 func readHosts() {
-	now := time.Seconds()
+	now := time.Now()
 	hp := hostsPath
-	if len(hosts.byName) == 0 || hosts.time+cacheMaxAge <= now || hosts.path != hp {
+	if len(hosts.byName) == 0 || now.After(hosts.expire) || hosts.path != hp {
 		hs := make(map[string][]string)
 		is := make(map[string][]string)
 		var file *file
@@ -51,7 +51,7 @@ func readHosts() {
 			}
 		}
 		// Update the data cache.
-		hosts.time = time.Seconds()
+		hosts.expire = time.Now().Add(cacheMaxAge)
 		hosts.path = hp
 		hosts.byName = hs
 		hosts.byAddr = is
diff --git a/src/pkg/net/http/cgi/host_test.go b/src/pkg/net/http/cgi/host_test.go
index 4e977040c07..9a8d3c01183 100644
--- a/src/pkg/net/http/cgi/host_test.go
+++ b/src/pkg/net/http/cgi/host_test.go
@@ -365,7 +365,7 @@ func TestCopyError(t *testing.T) {
 
 	tries := 0
 	for tries < 15 && childRunning() {
-		time.Sleep(50e6 * int64(tries))
+		time.Sleep(50 * time.Millisecond * time.Duration(tries))
 		tries++
 	}
 	if childRunning() {
diff --git a/src/pkg/net/http/cookie.go b/src/pkg/net/http/cookie.go
index 69350143248..cad852242e2 100644
--- a/src/pkg/net/http/cookie.go
+++ b/src/pkg/net/http/cookie.go
@@ -115,7 +115,7 @@ func readSetCookies(h Header) []*Cookie {
 						break
 					}
 				}
-				c.Expires = *exptime
+				c.Expires = exptime.UTC()
 				continue
 			case "path":
 				c.Path = val
@@ -146,8 +146,8 @@ func (c *Cookie) String() string {
 	if len(c.Domain) > 0 {
 		fmt.Fprintf(&b, "; Domain=%s", sanitizeValue(c.Domain))
 	}
-	if len(c.Expires.Zone) > 0 {
-		fmt.Fprintf(&b, "; Expires=%s", c.Expires.Format(time.RFC1123))
+	if c.Expires.Unix() > 0 {
+		fmt.Fprintf(&b, "; Expires=%s", c.Expires.UTC().Format(time.RFC1123))
 	}
 	if c.MaxAge > 0 {
 		fmt.Fprintf(&b, "; Max-Age=%d", c.MaxAge)
diff --git a/src/pkg/net/http/cookie_test.go b/src/pkg/net/http/cookie_test.go
index 24adf202981..26bff93f643 100644
--- a/src/pkg/net/http/cookie_test.go
+++ b/src/pkg/net/http/cookie_test.go
@@ -123,7 +123,7 @@ var readSetCookiesTests = []struct {
 			Path:       "/",
 			Domain:     ".google.ch",
 			HttpOnly:   true,
-			Expires:    time.Time{Year: 2011, Month: 11, Day: 23, Hour: 1, Minute: 5, Second: 3, ZoneOffset: 0, Zone: "GMT"},
+			Expires:    time.Date(2011, 11, 23, 1, 5, 3, 0, time.UTC),
 			RawExpires: "Wed, 23-Nov-2011 01:05:03 GMT",
 			Raw:        "NID=99=YsDT5i3E-CXax-; expires=Wed, 23-Nov-2011 01:05:03 GMT; path=/; domain=.google.ch; HttpOnly",
 		}},
diff --git a/src/pkg/net/http/export_test.go b/src/pkg/net/http/export_test.go
index 3fe658641f8..13640ca85ee 100644
--- a/src/pkg/net/http/export_test.go
+++ b/src/pkg/net/http/export_test.go
@@ -7,6 +7,8 @@
 
 package http
 
+import "time"
+
 func (t *Transport) IdleConnKeysForTesting() (keys []string) {
 	keys = make([]string, 0)
 	t.lk.Lock()
@@ -33,8 +35,8 @@ func (t *Transport) IdleConnCountForTesting(cacheKey string) int {
 	return len(conns)
 }
 
-func NewTestTimeoutHandler(handler Handler, ch <-chan int64) Handler {
-	f := func() <-chan int64 {
+func NewTestTimeoutHandler(handler Handler, ch <-chan time.Time) Handler {
+	f := func() <-chan time.Time {
 		return ch
 	}
 	return &timeoutHandler{handler, f, ""}
diff --git a/src/pkg/net/http/fcgi/child.go b/src/pkg/net/http/fcgi/child.go
index 529440cbe92..c94b9a7b249 100644
--- a/src/pkg/net/http/fcgi/child.go
+++ b/src/pkg/net/http/fcgi/child.go
@@ -103,7 +103,7 @@ func (r *response) WriteHeader(code int) {
 	}
 
 	if r.header.Get("Date") == "" {
-		r.header.Set("Date", time.UTC().Format(http.TimeFormat))
+		r.header.Set("Date", time.Now().UTC().Format(http.TimeFormat))
 	}
 
 	fmt.Fprintf(r.w, "Status: %d %s\r\n", code, http.StatusText(code))
diff --git a/src/pkg/net/http/fs.go b/src/pkg/net/http/fs.go
index 5aadac17a23..7f221886533 100644
--- a/src/pkg/net/http/fs.go
+++ b/src/pkg/net/http/fs.go
@@ -148,11 +148,11 @@ func serveFile(w ResponseWriter, r *Request, fs FileSystem, name string, redirec
 		}
 	}
 
-	if t, _ := time.Parse(TimeFormat, r.Header.Get("If-Modified-Since")); t != nil && d.Mtime_ns/1e9 <= t.Seconds() {
+	if t, err := time.Parse(TimeFormat, r.Header.Get("If-Modified-Since")); err == nil && !d.ModTime.After(t) {
 		w.WriteHeader(StatusNotModified)
 		return
 	}
-	w.Header().Set("Last-Modified", time.SecondsToUTC(d.Mtime_ns/1e9).Format(TimeFormat))
+	w.Header().Set("Last-Modified", d.ModTime.UTC().Format(TimeFormat))
 
 	// use contents of index.html for directory, if present
 	if d.IsDirectory() {
diff --git a/src/pkg/net/http/httptest/server.go b/src/pkg/net/http/httptest/server.go
index f09e826d9c9..5b02e143d4a 100644
--- a/src/pkg/net/http/httptest/server.go
+++ b/src/pkg/net/http/httptest/server.go
@@ -7,14 +7,12 @@
 package httptest
 
 import (
-	"crypto/rand"
 	"crypto/tls"
 	"flag"
 	"fmt"
 	"net"
 	"net/http"
 	"os"
-	"time"
 )
 
 // A Server is an HTTP server listening on a system-chosen port on the
@@ -113,8 +111,6 @@ func (s *Server) StartTLS() {
 	}
 
 	s.TLS = &tls.Config{
-		Rand:         rand.Reader,
-		Time:         time.Seconds,
 		NextProtos:   []string{"http/1.1"},
 		Certificates: []tls.Certificate{cert},
 	}
diff --git a/src/pkg/net/http/httputil/reverseproxy.go b/src/pkg/net/http/httputil/reverseproxy.go
index bfcb3ca6b11..1dc83e7d032 100644
--- a/src/pkg/net/http/httputil/reverseproxy.go
+++ b/src/pkg/net/http/httputil/reverseproxy.go
@@ -31,11 +31,11 @@ type ReverseProxy struct {
 	// If nil, http.DefaultTransport is used.
 	Transport http.RoundTripper
 
-	// FlushInterval specifies the flush interval, in
-	// nanoseconds, to flush to the client while
-	// coping the response body.
+	// FlushInterval specifies the flush interval
+	// to flush to the client while copying the
+	// response body.
 	// If zero, no periodic flushing is done.
-	FlushInterval int64
+	FlushInterval time.Duration
 }
 
 func singleJoiningSlash(a, b string) string {
@@ -135,7 +135,7 @@ type writeFlusher interface {
 
 type maxLatencyWriter struct {
 	dst     writeFlusher
-	latency int64 // nanos
+	latency time.Duration
 
 	lk   sync.Mutex // protects init of done, as well Write + Flush
 	done chan bool
diff --git a/src/pkg/net/http/pprof/pprof.go b/src/pkg/net/http/pprof/pprof.go
index c0327a94824..2de147579d1 100644
--- a/src/pkg/net/http/pprof/pprof.go
+++ b/src/pkg/net/http/pprof/pprof.go
@@ -80,7 +80,7 @@ func Profile(w http.ResponseWriter, r *http.Request) {
 		fmt.Fprintf(w, "Could not enable CPU profiling: %s\n", err)
 		return
 	}
-	time.Sleep(sec * 1e9)
+	time.Sleep(time.Duration(sec) * time.Second)
 	pprof.StopCPUProfile()
 }
 
diff --git a/src/pkg/net/http/serve_test.go b/src/pkg/net/http/serve_test.go
index 97a0b139e39..670b5418fcd 100644
--- a/src/pkg/net/http/serve_test.go
+++ b/src/pkg/net/http/serve_test.go
@@ -266,19 +266,19 @@ func TestServerTimeouts(t *testing.T) {
 	}
 
 	// Slow client that should timeout.
-	t1 := time.Nanoseconds()
+	t1 := time.Now()
 	conn, err := net.Dial("tcp", addr.String())
 	if err != nil {
 		t.Fatalf("Dial: %v", err)
 	}
 	buf := make([]byte, 1)
 	n, err := conn.Read(buf)
-	latency := time.Nanoseconds() - t1
+	latency := time.Now().Sub(t1)
 	if n != 0 || err != io.EOF {
 		t.Errorf("Read = %v, %v, wanted %v, %v", n, err, 0, io.EOF)
 	}
-	if latency < second*0.20 /* fudge from 0.25 above */ {
-		t.Errorf("got EOF after %d ns, want >= %d", latency, second*0.20)
+	if latency < 200*time.Millisecond /* fudge from 0.25 above */ {
+		t.Errorf("got EOF after %s, want >= %s", latency, 200*time.Millisecond)
 	}
 
 	// Hit the HTTP server successfully again, verifying that the
@@ -760,7 +760,7 @@ func TestTimeoutHandler(t *testing.T) {
 		_, werr := w.Write([]byte("hi"))
 		writeErrors <- werr
 	})
-	timeout := make(chan int64, 1) // write to this to force timeouts
+	timeout := make(chan time.Time, 1) // write to this to force timeouts
 	ts := httptest.NewServer(NewTestTimeoutHandler(sayHi, timeout))
 	defer ts.Close()
 
@@ -782,7 +782,7 @@ func TestTimeoutHandler(t *testing.T) {
 	}
 
 	// Times out:
-	timeout <- 1
+	timeout <- time.Time{}
 	res, err = Get(ts.URL)
 	if err != nil {
 		t.Error(err)
diff --git a/src/pkg/net/http/server.go b/src/pkg/net/http/server.go
index 0e8580a6ff6..125f3f214bb 100644
--- a/src/pkg/net/http/server.go
+++ b/src/pkg/net/http/server.go
@@ -347,7 +347,7 @@ func (w *response) WriteHeader(code int) {
 	}
 
 	if _, ok := w.header["Date"]; !ok {
-		w.Header().Set("Date", time.UTC().Format(TimeFormat))
+		w.Header().Set("Date", time.Now().UTC().Format(TimeFormat))
 	}
 
 	te := w.header.Get("Transfer-Encoding")
@@ -1084,7 +1084,6 @@ func (s *Server) ListenAndServeTLS(certFile, keyFile string) error {
 	}
 	config := &tls.Config{
 		Rand:       rand.Reader,
-		Time:       time.Seconds,
 		NextProtos: []string{"http/1.1"},
 	}
 
@@ -1112,9 +1111,9 @@ func (s *Server) ListenAndServeTLS(certFile, keyFile string) error {
 // (If msg is empty, a suitable default message will be sent.)
 // After such a timeout, writes by h to its ResponseWriter will return
 // ErrHandlerTimeout.
-func TimeoutHandler(h Handler, ns int64, msg string) Handler {
-	f := func() <-chan int64 {
-		return time.After(ns)
+func TimeoutHandler(h Handler, dt time.Duration, msg string) Handler {
+	f := func() <-chan time.Time {
+		return time.After(dt)
 	}
 	return &timeoutHandler{h, f, msg}
 }
@@ -1125,7 +1124,7 @@ var ErrHandlerTimeout = errors.New("http: Handler timeout")
 
 type timeoutHandler struct {
 	handler Handler
-	timeout func() <-chan int64 // returns channel producing a timeout
+	timeout func() <-chan time.Time // returns channel producing a timeout
 	body    string
 }
 
diff --git a/src/pkg/net/http/transport_test.go b/src/pkg/net/http/transport_test.go
index 77297972449..6f50f6f2767 100644
--- a/src/pkg/net/http/transport_test.go
+++ b/src/pkg/net/http/transport_test.go
@@ -263,7 +263,7 @@ func TestTransportServerClosingUnexpectedly(t *testing.T) {
 				t.Fatalf(format, arg...)
 			}
 			t.Logf("retrying shortly after expected error: "+format, arg...)
-			time.Sleep(1e9 / int64(retries))
+			time.Sleep(time.Second / time.Duration(retries))
 		}
 		for retries >= 0 {
 			retries--
diff --git a/src/pkg/net/mail/message.go b/src/pkg/net/mail/message.go
index a1a86d3c6f7..e1afa32062f 100644
--- a/src/pkg/net/mail/message.go
+++ b/src/pkg/net/mail/message.go
@@ -89,14 +89,14 @@ func init() {
 	}
 }
 
-func parseDate(date string) (*time.Time, error) {
+func parseDate(date string) (time.Time, error) {
 	for _, layout := range dateLayouts {
 		t, err := time.Parse(layout, date)
 		if err == nil {
 			return t, nil
 		}
 	}
-	return nil, errors.New("mail: header could not be parsed")
+	return time.Time{}, errors.New("mail: header could not be parsed")
 }
 
 // A Header represents the key-value pairs in a mail message header.
@@ -111,10 +111,10 @@ func (h Header) Get(key string) string {
 var ErrHeaderNotPresent = errors.New("mail: header not in message")
 
 // Date parses the Date header field.
-func (h Header) Date() (*time.Time, error) {
+func (h Header) Date() (time.Time, error) {
 	hdr := h.Get("Date")
 	if hdr == "" {
-		return nil, ErrHeaderNotPresent
+		return time.Time{}, ErrHeaderNotPresent
 	}
 	return parseDate(hdr)
 }
diff --git a/src/pkg/net/mail/message_test.go b/src/pkg/net/mail/message_test.go
index 5653647b8cc..1f71cc480af 100644
--- a/src/pkg/net/mail/message_test.go
+++ b/src/pkg/net/mail/message_test.go
@@ -82,34 +82,18 @@ func headerEq(a, b Header) bool {
 func TestDateParsing(t *testing.T) {
 	tests := []struct {
 		dateStr string
-		exp     *time.Time
+		exp     time.Time
 	}{
 		// RFC 5322, Appendix A.1.1
 		{
 			"Fri, 21 Nov 1997 09:55:06 -0600",
-			&time.Time{
-				Year:       1997,
-				Month:      11,
-				Day:        21,
-				Hour:       9,
-				Minute:     55,
-				Second:     6,
-				ZoneOffset: -6 * 60 * 60,
-			},
+			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("", -6*60*60)),
 		},
 		// RFC5322, Appendix A.6.2
 		// Obsolete date.
 		{
 			"21 Nov 97 09:55:06 GMT",
-			&time.Time{
-				Year:   1997,
-				Month:  11,
-				Day:    21,
-				Hour:   9,
-				Minute: 55,
-				Second: 6,
-				Zone:   "GMT",
-			},
+			time.Date(1997, 11, 21, 9, 55, 6, 0, time.FixedZone("GMT", 0)),
 		},
 	}
 	for _, test := range tests {
diff --git a/src/pkg/net/timeout_test.go b/src/pkg/net/timeout_test.go
index 3c884ca7cfe..f6e5238c1b1 100644
--- a/src/pkg/net/timeout_test.go
+++ b/src/pkg/net/timeout_test.go
@@ -17,7 +17,7 @@ func testTimeout(t *testing.T, network, addr string, readFrom bool) {
 		return
 	}
 	defer fd.Close()
-	t0 := time.Nanoseconds()
+	t0 := time.Now()
 	fd.SetReadTimeout(1e8) // 100ms
 	var b [100]byte
 	var n int
@@ -27,7 +27,7 @@ func testTimeout(t *testing.T, network, addr string, readFrom bool) {
 	} else {
 		n, err1 = fd.Read(b[0:])
 	}
-	t1 := time.Nanoseconds()
+	t1 := time.Now()
 	what := "Read"
 	if readFrom {
 		what = "ReadFrom"
@@ -35,8 +35,8 @@ func testTimeout(t *testing.T, network, addr string, readFrom bool) {
 	if n != 0 || err1 == nil || !err1.(Error).Timeout() {
 		t.Errorf("fd.%s on %s %s did not return 0, timeout: %v, %v", what, network, addr, n, err1)
 	}
-	if t1-t0 < 0.5e8 || t1-t0 > 1.5e8 {
-		t.Errorf("fd.%s on %s %s took %f seconds, expected 0.1", what, network, addr, float64(t1-t0)/1e9)
+	if dt := t1.Sub(t0); dt < 50*time.Millisecond || dt > 150*time.Millisecond {
+		t.Errorf("fd.%s on %s %s took %s, expected 0.1s", what, network, addr, dt)
 	}
 }
 
diff --git a/src/pkg/old/netchan/common.go b/src/pkg/old/netchan/common.go
index dfd1fd03427..03fa8ff6c41 100644
--- a/src/pkg/old/netchan/common.go
+++ b/src/pkg/old/netchan/common.go
@@ -129,8 +129,8 @@ func (ed *encDec) encode(hdr *header, payloadType int, payload interface{}) erro
 }
 
 // See the comment for Exporter.Drain.
-func (cs *clientSet) drain(timeout int64) error {
-	startTime := time.Nanoseconds()
+func (cs *clientSet) drain(timeout time.Duration) error {
+	deadline := time.Now().Add(timeout)
 	for {
 		pending := false
 		cs.mu.Lock()
@@ -152,7 +152,7 @@ func (cs *clientSet) drain(timeout int64) error {
 		if !pending {
 			break
 		}
-		if timeout > 0 && time.Nanoseconds()-startTime >= timeout {
+		if timeout > 0 && time.Now().After(deadline) {
 			return errors.New("timeout")
 		}
 		time.Sleep(100 * 1e6) // 100 milliseconds
@@ -161,8 +161,8 @@ func (cs *clientSet) drain(timeout int64) error {
 }
 
 // See the comment for Exporter.Sync.
-func (cs *clientSet) sync(timeout int64) error {
-	startTime := time.Nanoseconds()
+func (cs *clientSet) sync(timeout time.Duration) error {
+	deadline := time.Now().Add(timeout)
 	// seq remembers the clients and their seqNum at point of entry.
 	seq := make(map[unackedCounter]int64)
 	for client := range cs.clients {
@@ -185,7 +185,7 @@ func (cs *clientSet) sync(timeout int64) error {
 		if !pending {
 			break
 		}
-		if timeout > 0 && time.Nanoseconds()-startTime >= timeout {
+		if timeout > 0 && time.Now().After(deadline) {
 			return errors.New("timeout")
 		}
 		time.Sleep(100 * 1e6) // 100 milliseconds
diff --git a/src/pkg/old/netchan/export.go b/src/pkg/old/netchan/export.go
index d698dd53a90..d94c4b16b21 100644
--- a/src/pkg/old/netchan/export.go
+++ b/src/pkg/old/netchan/export.go
@@ -29,6 +29,7 @@ import (
 	"reflect"
 	"strconv"
 	"sync"
+	"time"
 )
 
 // Export
@@ -322,9 +323,9 @@ func (exp *Exporter) delClient(client *expClient) {
 // those not yet sent to any client and possibly including those sent while
 // Drain was executing, have been received by the importer.  In short, it
 // waits until all the exporter's messages have been received by a client.
-// If the timeout (measured in nanoseconds) is positive and Drain takes
-// longer than that to complete, an error is returned.
-func (exp *Exporter) Drain(timeout int64) error {
+// If the timeout is positive and Drain takes longer than that to complete,
+// an error is returned.
+func (exp *Exporter) Drain(timeout time.Duration) error {
 	// This wrapper function is here so the method's comment will appear in godoc.
 	return exp.clientSet.drain(timeout)
 }
@@ -332,10 +333,9 @@ func (exp *Exporter) Drain(timeout int64) error {
 // Sync waits until all clients of the exporter have received the messages
 // that were sent at the time Sync was invoked.  Unlike Drain, it does not
 // wait for messages sent while it is running or messages that have not been
-// dispatched to any client.  If the timeout (measured in nanoseconds) is
-// positive and Sync takes longer than that to complete, an error is
-// returned.
-func (exp *Exporter) Sync(timeout int64) error {
+// dispatched to any client.  If the timeout is positive and Sync takes longer
+// than that to complete, an error is returned.
+func (exp *Exporter) Sync(timeout time.Duration) error {
 	// This wrapper function is here so the method's comment will appear in godoc.
 	return exp.clientSet.sync(timeout)
 }
diff --git a/src/pkg/old/netchan/import.go b/src/pkg/old/netchan/import.go
index 7243672ecd3..a6da8210b99 100644
--- a/src/pkg/old/netchan/import.go
+++ b/src/pkg/old/netchan/import.go
@@ -276,9 +276,9 @@ func (imp *Importer) unackedCount() int64 {
 // If the timeout (measured in nanoseconds) is positive and Drain takes
 // longer than that to complete, an error is returned.
 func (imp *Importer) Drain(timeout int64) error {
-	startTime := time.Nanoseconds()
+	deadline := time.Now().Add(time.Duration(timeout))
 	for imp.unackedCount() > 0 {
-		if timeout > 0 && time.Nanoseconds()-startTime >= timeout {
+		if timeout > 0 && time.Now().After(deadline) {
 			return errors.New("timeout")
 		}
 		time.Sleep(100 * 1e6)
diff --git a/src/pkg/os/file_posix.go b/src/pkg/os/file_posix.go
index c80d3df5e50..9662f64da3a 100644
--- a/src/pkg/os/file_posix.go
+++ b/src/pkg/os/file_posix.go
@@ -8,6 +8,7 @@ package os
 
 import (
 	"syscall"
+	"time"
 )
 
 func sigpipe() // implemented in package runtime
@@ -181,11 +182,12 @@ func (file *File) Sync() (err error) {
 // Chtimes changes the access and modification times of the named
 // file, similar to the Unix utime() or utimes() functions.
 //
-// The argument times are in nanoseconds, although the underlying
-// filesystem may truncate or round the values to a more
-// coarse time unit.
-func Chtimes(name string, atime_ns int64, mtime_ns int64) error {
+// The underlying filesystem may truncate or round the values to a
+// less precise time unit.
+func Chtimes(name string, atime time.Time, mtime time.Time) error {
 	var utimes [2]syscall.Timeval
+	atime_ns := atime.Unix()*1e9 + int64(atime.Nanosecond())
+	mtime_ns := mtime.Unix()*1e9 + int64(mtime.Nanosecond())
 	utimes[0] = syscall.NsecToTimeval(atime_ns)
 	utimes[1] = syscall.NsecToTimeval(mtime_ns)
 	if e := syscall.Utimes(name, utimes[0:]); e != nil {
diff --git a/src/pkg/os/os_test.go b/src/pkg/os/os_test.go
index c2fbc9fdd5c..2439f03348c 100644
--- a/src/pkg/os/os_test.go
+++ b/src/pkg/os/os_test.go
@@ -14,6 +14,7 @@ import (
 	"strings"
 	"syscall"
 	"testing"
+	"time"
 )
 
 var dot = []string{
@@ -719,8 +720,7 @@ func TestChtimes(t *testing.T) {
 	}
 
 	// Move access and modification time back a second
-	const OneSecond = 1e9 // in nanoseconds
-	err = Chtimes(f.Name(), preStat.Atime_ns-OneSecond, preStat.Mtime_ns-OneSecond)
+	err = Chtimes(f.Name(), preStat.AccessTime.Add(-time.Second), preStat.ModTime.Add(-time.Second))
 	if err != nil {
 		t.Fatalf("Chtimes %s: %s", f.Name(), err)
 	}
@@ -734,16 +734,16 @@ func TestChtimes(t *testing.T) {
 		Mtime is the time of the last change of content.  Similarly, atime is set whenever the
 	    contents are accessed; also, it is set whenever mtime is set.
 	*/
-	if postStat.Atime_ns >= preStat.Atime_ns && syscall.OS != "plan9" {
-		t.Errorf("Atime_ns didn't go backwards; was=%d, after=%d",
-			preStat.Atime_ns,
-			postStat.Atime_ns)
+	if !postStat.AccessTime.Before(preStat.AccessTime) && syscall.OS != "plan9" {
+		t.Errorf("AccessTime didn't go backwards; was=%d, after=%d",
+			preStat.AccessTime,
+			postStat.AccessTime)
 	}
 
-	if postStat.Mtime_ns >= preStat.Mtime_ns {
-		t.Errorf("Mtime_ns didn't go backwards; was=%d, after=%d",
-			preStat.Mtime_ns,
-			postStat.Mtime_ns)
+	if !postStat.ModTime.Before(preStat.ModTime) {
+		t.Errorf("ModTime didn't go backwards; was=%d, after=%d",
+			preStat.ModTime,
+			postStat.ModTime)
 	}
 }
 
diff --git a/src/pkg/os/stat_darwin.go b/src/pkg/os/stat_darwin.go
index 0661a6d5914..00bf612746a 100644
--- a/src/pkg/os/stat_darwin.go
+++ b/src/pkg/os/stat_darwin.go
@@ -4,7 +4,10 @@
 
 package os
 
-import "syscall"
+import (
+	"syscall"
+	"time"
+)
 
 func isSymlink(stat *syscall.Stat_t) bool {
 	return stat.Mode&syscall.S_IFMT == syscall.S_IFLNK
@@ -21,12 +24,16 @@ func fileInfoFromStat(name string, fi *FileInfo, lstat, stat *syscall.Stat_t) *F
 	fi.Size = stat.Size
 	fi.Blksize = int64(stat.Blksize)
 	fi.Blocks = stat.Blocks
-	fi.Atime_ns = syscall.TimespecToNsec(stat.Atimespec)
-	fi.Mtime_ns = syscall.TimespecToNsec(stat.Mtimespec)
-	fi.Ctime_ns = syscall.TimespecToNsec(stat.Ctimespec)
+	fi.AccessTime = timespecToTime(stat.Atimespec)
+	fi.ModTime = timespecToTime(stat.Mtimespec)
+	fi.ChangeTime = timespecToTime(stat.Ctimespec)
 	fi.Name = basename(name)
 	if isSymlink(lstat) && !isSymlink(stat) {
 		fi.FollowedSymlink = true
 	}
 	return fi
 }
+
+func timespecToTime(ts syscall.Timespec) time.Time {
+	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
+}
diff --git a/src/pkg/os/stat_freebsd.go b/src/pkg/os/stat_freebsd.go
index 454165d4e0f..a82a0b7bb1b 100644
--- a/src/pkg/os/stat_freebsd.go
+++ b/src/pkg/os/stat_freebsd.go
@@ -4,7 +4,10 @@
 
 package os
 
-import "syscall"
+import (
+	"syscall"
+	"time"
+)
 
 func isSymlink(stat *syscall.Stat_t) bool {
 	return stat.Mode&syscall.S_IFMT == syscall.S_IFLNK
@@ -21,12 +24,16 @@ func fileInfoFromStat(name string, fi *FileInfo, lstat, stat *syscall.Stat_t) *F
 	fi.Size = int64(stat.Size)
 	fi.Blksize = int64(stat.Blksize)
 	fi.Blocks = stat.Blocks
-	fi.Atime_ns = syscall.TimespecToNsec(stat.Atimespec)
-	fi.Mtime_ns = syscall.TimespecToNsec(stat.Mtimespec)
-	fi.Ctime_ns = syscall.TimespecToNsec(stat.Ctimespec)
+	fi.AccessTime = timespecToTime(stat.Atimespec)
+	fi.ModTime = timespecToTime(stat.Mtimespec)
+	fi.ChangeTime = timespecToTime(stat.Ctimespec)
 	fi.Name = basename(name)
 	if isSymlink(lstat) && !isSymlink(stat) {
 		fi.FollowedSymlink = true
 	}
 	return fi
 }
+
+func timespecToTime(ts syscall.Timespec) time.Time {
+	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
+}
diff --git a/src/pkg/os/stat_linux.go b/src/pkg/os/stat_linux.go
index 7a3cf794d69..5f9c115e299 100644
--- a/src/pkg/os/stat_linux.go
+++ b/src/pkg/os/stat_linux.go
@@ -4,7 +4,10 @@
 
 package os
 
-import "syscall"
+import (
+	"syscall"
+	"time"
+)
 
 func isSymlink(stat *syscall.Stat_t) bool {
 	return stat.Mode&syscall.S_IFMT == syscall.S_IFLNK
@@ -21,12 +24,16 @@ func fileInfoFromStat(name string, fi *FileInfo, lstat, stat *syscall.Stat_t) *F
 	fi.Size = stat.Size
 	fi.Blksize = int64(stat.Blksize)
 	fi.Blocks = stat.Blocks
-	fi.Atime_ns = syscall.TimespecToNsec(stat.Atim)
-	fi.Mtime_ns = syscall.TimespecToNsec(stat.Mtim)
-	fi.Ctime_ns = syscall.TimespecToNsec(stat.Ctim)
+	fi.AccessTime = timespecToTime(stat.Atim)
+	fi.ModTime = timespecToTime(stat.Mtim)
+	fi.ChangeTime = timespecToTime(stat.Ctim)
 	fi.Name = basename(name)
 	if isSymlink(lstat) && !isSymlink(stat) {
 		fi.FollowedSymlink = true
 	}
 	return fi
 }
+
+func timespecToTime(ts syscall.Timespec) time.Time {
+	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
+}
diff --git a/src/pkg/os/stat_openbsd.go b/src/pkg/os/stat_openbsd.go
index 6d3a3813b09..943d34c4022 100644
--- a/src/pkg/os/stat_openbsd.go
+++ b/src/pkg/os/stat_openbsd.go
@@ -4,7 +4,10 @@
 
 package os
 
-import "syscall"
+import (
+	"syscall"
+	"time"
+)
 
 func isSymlink(stat *syscall.Stat_t) bool {
 	return stat.Mode&syscall.S_IFMT == syscall.S_IFLNK
@@ -21,12 +24,16 @@ func fileInfoFromStat(name string, fi *FileInfo, lstat, stat *syscall.Stat_t) *F
 	fi.Size = int64(stat.Size)
 	fi.Blksize = int64(stat.Blksize)
 	fi.Blocks = stat.Blocks
-	fi.Atime_ns = syscall.TimespecToNsec(stat.Atim)
-	fi.Mtime_ns = syscall.TimespecToNsec(stat.Mtim)
-	fi.Ctime_ns = syscall.TimespecToNsec(stat.Ctim)
+	fi.AccessTime = timespecToTime(stat.Atim)
+	fi.ModTime = timespecToTime(stat.Mtim)
+	fi.ChangeTime = timespecToTime(stat.Ctim)
 	fi.Name = basename(name)
 	if isSymlink(lstat) && !isSymlink(stat) {
 		fi.FollowedSymlink = true
 	}
 	return fi
 }
+
+func timespecToTime(ts syscall.Timespec) time.Time {
+	return time.Unix(int64(ts.Sec), int64(ts.Nsec))
+}
diff --git a/src/pkg/os/stat_windows.go b/src/pkg/os/stat_windows.go
index a6f3723a731..b226b2913bb 100644
--- a/src/pkg/os/stat_windows.go
+++ b/src/pkg/os/stat_windows.go
@@ -6,6 +6,7 @@ package os
 
 import (
 	"syscall"
+	"time"
 	"unsafe"
 )
 
@@ -91,8 +92,8 @@ func setFileInfo(fi *FileInfo, name string, fa, sizehi, sizelo uint32, ctime, at
 	fi.Size = int64(sizehi)<<32 + int64(sizelo)
 	fi.Name = name
 	fi.FollowedSymlink = false
-	fi.Atime_ns = atime.Nanoseconds()
-	fi.Mtime_ns = wtime.Nanoseconds()
-	fi.Ctime_ns = ctime.Nanoseconds()
+	fi.AccessTime = time.Unix(0, atime.Nanoseconds())
+	fi.ModTime = time.Unix(0, wtime.Nanoseconds())
+	fi.ChangeTime = time.Unix(0, ctime.Nanoseconds())
 	return fi
 }
diff --git a/src/pkg/os/types.go b/src/pkg/os/types.go
index df57b59a388..3f8ac78350e 100644
--- a/src/pkg/os/types.go
+++ b/src/pkg/os/types.go
@@ -4,7 +4,10 @@
 
 package os
 
-import "syscall"
+import (
+	"syscall"
+	"time"
+)
 
 // An operating-system independent representation of Unix data structures.
 // OS-specific routines in this directory convert the OS-local versions to these.
@@ -14,21 +17,21 @@ func Getpagesize() int { return syscall.Getpagesize() }
 
 // A FileInfo describes a file and is returned by Stat, Fstat, and Lstat
 type FileInfo struct {
-	Dev             uint64 // device number of file system holding file.
-	Ino             uint64 // inode number.
-	Nlink           uint64 // number of hard links.
-	Mode            uint32 // permission and mode bits.
-	Uid             int    // user id of owner.
-	Gid             int    // group id of owner.
-	Rdev            uint64 // device type for special file.
-	Size            int64  // length in bytes.
-	Blksize         int64  // size of blocks, in bytes.
-	Blocks          int64  // number of blocks allocated for file.
-	Atime_ns        int64  // access time; nanoseconds since epoch.
-	Mtime_ns        int64  // modified time; nanoseconds since epoch.
-	Ctime_ns        int64  // status change time; nanoseconds since epoch.
-	Name            string // base name of the file name provided in Open, Stat, etc.
-	FollowedSymlink bool   // followed a symlink to get this information
+	Dev             uint64    // device number of file system holding file.
+	Ino             uint64    // inode number.
+	Nlink           uint64    // number of hard links.
+	Mode            uint32    // permission and mode bits.
+	Uid             int       // user id of owner.
+	Gid             int       // group id of owner.
+	Rdev            uint64    // device type for special file.
+	Size            int64     // length in bytes.
+	Blksize         int64     // size of blocks, in bytes.
+	Blocks          int64     // number of blocks allocated for file.
+	AccessTime      time.Time // access time
+	ModTime         time.Time // modification time
+	ChangeTime      time.Time // status change time
+	Name            string    // base name of the file name provided in Open, Stat, etc.
+	FollowedSymlink bool      // followed a symlink to get this information
 }
 
 // IsFifo reports whether the FileInfo describes a FIFO file.
diff --git a/src/pkg/testing/benchmark.go b/src/pkg/testing/benchmark.go
index 4f049a31f75..e81e5c5845c 100644
--- a/src/pkg/testing/benchmark.go
+++ b/src/pkg/testing/benchmark.go
@@ -27,17 +27,19 @@ type InternalBenchmark struct {
 type B struct {
 	N         int
 	benchmark InternalBenchmark
-	ns        int64
+	ns        time.Duration
 	bytes     int64
-	start     int64
+	start     time.Time
+	timerOn   bool
 }
 
 // StartTimer starts timing a test.  This function is called automatically
 // before a benchmark starts, but it can also used to resume timing after
 // a call to StopTimer.
 func (b *B) StartTimer() {
-	if b.start == 0 {
-		b.start = time.Nanoseconds()
+	if !b.timerOn {
+		b.start = time.Now()
+		b.timerOn = true
 	}
 }
 
@@ -45,17 +47,17 @@ func (b *B) StartTimer() {
 // while performing complex initialization that you don't
 // want to measure.
 func (b *B) StopTimer() {
-	if b.start > 0 {
-		b.ns += time.Nanoseconds() - b.start
+	if b.timerOn {
+		b.ns += time.Now().Sub(b.start)
+		b.timerOn = false
 	}
-	b.start = 0
 }
 
 // ResetTimer sets the elapsed benchmark time to zero.
 // It does not affect whether the timer is running.
 func (b *B) ResetTimer() {
-	if b.start > 0 {
-		b.start = time.Nanoseconds()
+	if b.timerOn {
+		b.start = time.Now()
 	}
 	b.ns = 0
 }
@@ -68,7 +70,7 @@ func (b *B) nsPerOp() int64 {
 	if b.N <= 0 {
 		return 0
 	}
-	return b.ns / int64(b.N)
+	return b.ns.Nanoseconds() / int64(b.N)
 }
 
 // runN runs a single benchmark for the specified number of iterations.
@@ -134,14 +136,14 @@ func (b *B) run() BenchmarkResult {
 	n := 1
 	b.runN(n)
 	// Run the benchmark for at least the specified amount of time.
-	time := int64(*benchTime * 1e9)
-	for b.ns < time && n < 1e9 {
+	d := time.Duration(*benchTime * float64(time.Second))
+	for b.ns < d && n < 1e9 {
 		last := n
 		// Predict iterations/sec.
 		if b.nsPerOp() == 0 {
 			n = 1e9
 		} else {
-			n = int(time / b.nsPerOp())
+			n = int(d.Nanoseconds() / b.nsPerOp())
 		}
 		// Run more iterations than we think we'll need for a second (1.5x).
 		// Don't grow too fast in case we had timing errors previously.
@@ -156,23 +158,23 @@ func (b *B) run() BenchmarkResult {
 
 // The results of a benchmark run.
 type BenchmarkResult struct {
-	N     int   // The number of iterations.
-	Ns    int64 // The total time taken.
-	Bytes int64 // Bytes processed in one iteration.
+	N     int           // The number of iterations.
+	T     time.Duration // The total time taken.
+	Bytes int64         // Bytes processed in one iteration.
 }
 
 func (r BenchmarkResult) NsPerOp() int64 {
 	if r.N <= 0 {
 		return 0
 	}
-	return r.Ns / int64(r.N)
+	return r.T.Nanoseconds() / int64(r.N)
 }
 
 func (r BenchmarkResult) mbPerSec() float64 {
-	if r.Bytes <= 0 || r.Ns <= 0 || r.N <= 0 {
+	if r.Bytes <= 0 || r.T <= 0 || r.N <= 0 {
 		return 0
 	}
-	return float64(r.Bytes) * float64(r.N) / float64(r.Ns) * 1e3
+	return (float64(r.Bytes) * float64(r.N) / 1e6) / r.T.Seconds()
 }
 
 func (r BenchmarkResult) String() string {
@@ -187,9 +189,9 @@ func (r BenchmarkResult) String() string {
 		// The format specifiers here make sure that
 		// the ones digits line up for all three possible formats.
 		if nsop < 10 {
-			ns = fmt.Sprintf("%13.2f ns/op", float64(r.Ns)/float64(r.N))
+			ns = fmt.Sprintf("%13.2f ns/op", float64(r.T.Nanoseconds())/float64(r.N))
 		} else {
-			ns = fmt.Sprintf("%12.1f ns/op", float64(r.Ns)/float64(r.N))
+			ns = fmt.Sprintf("%12.1f ns/op", float64(r.T.Nanoseconds())/float64(r.N))
 		}
 	}
 	return fmt.Sprintf("%8d\t%s%s", r.N, ns, mb)
diff --git a/src/pkg/testing/example.go b/src/pkg/testing/example.go
index 3b026ee66e0..e23f13b6f16 100644
--- a/src/pkg/testing/example.go
+++ b/src/pkg/testing/example.go
@@ -56,9 +56,9 @@ func RunExamples(examples []InternalExample) (ok bool) {
 		}()
 
 		// run example
-		ns := -time.Nanoseconds()
+		t0 := time.Now()
 		eg.F()
-		ns += time.Nanoseconds()
+		dt := time.Now().Sub(t0)
 
 		// close pipe, restore stdout/stderr, get output
 		w.Close()
@@ -66,7 +66,7 @@ func RunExamples(examples []InternalExample) (ok bool) {
 		out := <-outC
 
 		// report any errors
-		tstr := fmt.Sprintf("(%.2f seconds)", float64(ns)/1e9)
+		tstr := fmt.Sprintf("(%.2f seconds)", dt.Seconds())
 		if out != eg.Output {
 			fmt.Printf(
 				"--- FAIL: %s %s\ngot:\n%s\nwant:\n%s\n",
diff --git a/src/pkg/testing/testing.go b/src/pkg/testing/testing.go
index 08443a31259..0b3a07108cc 100644
--- a/src/pkg/testing/testing.go
+++ b/src/pkg/testing/testing.go
@@ -111,12 +111,13 @@ func decorate(s string, addFileLine bool) string {
 // T is a type passed to Test functions to manage test state and support formatted test logs.
 // Logs are accumulated during execution and dumped to standard error when done.
 type T struct {
-	name          string    // Name of test.
-	errors        string    // Error string from test.
-	failed        bool      // Test has failed.
-	ch            chan *T   // Output for serial tests.
-	startParallel chan bool // Parallel tests will wait on this.
-	ns            int64     // Duration of test in nanoseconds.
+	name          string        // Name of test.
+	errors        string        // Error string from test.
+	failed        bool          // Test has failed.
+	ch            chan *T       // Output for serial tests.
+	startParallel chan bool     // Parallel tests will wait on this.
+	start         time.Time     // Time test started
+	dt            time.Duration // Length of test
 }
 
 // Fail marks the Test function as having failed but continues execution.
@@ -128,7 +129,7 @@ func (t *T) Failed() bool { return t.failed }
 // FailNow marks the Test function as having failed and stops its execution.
 // Execution will continue at the next Test.
 func (t *T) FailNow() {
-	t.ns = time.Nanoseconds() - t.ns
+	t.dt = time.Now().Sub(t.start)
 	t.Fail()
 	t.ch <- t
 	runtime.Goexit()
@@ -184,9 +185,9 @@ type InternalTest struct {
 }
 
 func tRunner(t *T, test *InternalTest) {
-	t.ns = time.Nanoseconds()
+	t.start = time.Now()
 	test.F(t)
-	t.ns = time.Nanoseconds() - t.ns
+	t.dt = time.Now().Sub(t.start)
 	t.ch <- t
 }
 
@@ -211,7 +212,7 @@ func Main(matchString func(pat, str string) (bool, error), tests []InternalTest,
 }
 
 func report(t *T) {
-	tstr := fmt.Sprintf("(%.2f seconds)", float64(t.ns)/1e9)
+	tstr := fmt.Sprintf("(%.2f seconds)", t.dt.Seconds())
 	format := "--- %s: %s %s\n%s"
 	if t.failed {
 		fmt.Printf(format, "FAIL", t.name, tstr, t.errors)
diff --git a/test/initsyscall.go b/test/initsyscall.go
index b5e5812b64b..d0c26d2a837 100644
--- a/test/initsyscall.go
+++ b/test/initsyscall.go
@@ -19,9 +19,8 @@ func f() {
 
 func init() {
 	go f()
-	time.Nanoseconds()
+	time.Now()
 }
 
 func main() {
 }
-