diff --git a/src/time/format.go b/src/time/format.go
index 3608b04e445..3fbfa734d05 100644
--- a/src/time/format.go
+++ b/src/time/format.go
@@ -1012,7 +1012,7 @@ func parse(layout, value string, defaultLocation, local *Location) (Time, error)
 	}
 
 	// Validate the day of the month.
-	if day > daysIn(Month(month), year) {
+	if day < 1 || day > daysIn(Month(month), year) {
 		return Time{}, &ParseError{alayout, avalue, "", value, ": day out of range"}
 	}
 
diff --git a/src/time/format_test.go b/src/time/format_test.go
index 640e8180e39..aa4434a09c3 100644
--- a/src/time/format_test.go
+++ b/src/time/format_test.go
@@ -224,6 +224,7 @@ var dayOutOfRangeTests = []struct {
 	{"Thu Nov 31 21:00:57 2010", false},
 	{"Thu Dec 31 21:00:57 2010", true},
 	{"Thu Dec 32 21:00:57 2010", false},
+	{"Thu Dec 00 21:00:57 2010", false},
 }
 
 func TestParseDayOutOfRange(t *testing.T) {