diff --git a/src/time/example_test.go b/src/time/example_test.go
index 059c6310a6..cfdee8f4d7 100644
--- a/src/time/example_test.go
+++ b/src/time/example_test.go
@@ -591,19 +591,33 @@ func ExampleTime_Add() {
 }
 
 func ExampleTime_AddDate() {
-	start := time.Date(2009, 1, 1, 0, 0, 0, 0, time.UTC)
+	start := time.Date(2023, 03, 25, 12, 0, 0, 0, time.UTC)
 	oneDayLater := start.AddDate(0, 0, 1)
+	dayDuration := oneDayLater.Sub(start)
 	oneMonthLater := start.AddDate(0, 1, 0)
 	oneYearLater := start.AddDate(1, 0, 0)
 
+	zurich, err := time.LoadLocation("Europe/Zurich")
+	if err != nil {
+		panic(err)
+	}
+	// This was the day before a daylight saving time transition in Zürich.
+	startZurich := time.Date(2023, 03, 25, 12, 0, 0, 0, zurich)
+	oneDayLaterZurich := startZurich.AddDate(0, 0, 1)
+	dayDurationZurich := oneDayLaterZurich.Sub(startZurich)
+
 	fmt.Printf("oneDayLater: start.AddDate(0, 0, 1) = %v\n", oneDayLater)
 	fmt.Printf("oneMonthLater: start.AddDate(0, 1, 0) = %v\n", oneMonthLater)
 	fmt.Printf("oneYearLater: start.AddDate(1, 0, 0) = %v\n", oneYearLater)
+	fmt.Printf("oneDayLaterZurich: startZurich.AddDate(0, 0, 1) = %v\n", oneDayLaterZurich)
+	fmt.Printf("Day duration in UTC: %v | Day duration in Zürich: %v\n", dayDuration, dayDurationZurich)
 
 	// Output:
-	// oneDayLater: start.AddDate(0, 0, 1) = 2009-01-02 00:00:00 +0000 UTC
-	// oneMonthLater: start.AddDate(0, 1, 0) = 2009-02-01 00:00:00 +0000 UTC
-	// oneYearLater: start.AddDate(1, 0, 0) = 2010-01-01 00:00:00 +0000 UTC
+	// oneDayLater: start.AddDate(0, 0, 1) = 2023-03-26 12:00:00 +0000 UTC
+	// oneMonthLater: start.AddDate(0, 1, 0) = 2023-04-25 12:00:00 +0000 UTC
+	// oneYearLater: start.AddDate(1, 0, 0) = 2024-03-25 12:00:00 +0000 UTC
+	// oneDayLaterZurich: startZurich.AddDate(0, 0, 1) = 2023-03-26 12:00:00 +0200 CEST
+	// Day duration in UTC: 24h0m0s | Day duration in Zürich: 23h0m0s
 }
 
 func ExampleTime_After() {
diff --git a/src/time/time.go b/src/time/time.go
index 3d4416e76b..1db9d3768e 100644
--- a/src/time/time.go
+++ b/src/time/time.go
@@ -109,12 +109,11 @@ import (
 // As this time is unlikely to come up in practice, the IsZero method gives
 // a simple way of detecting a time that has not been initialized explicitly.
 //
-// Each Time has associated with it a Location, consulted when computing the
-// presentation form of the time, such as in the Format, Hour, and Year methods.
-// The methods Local, UTC, and In return a Time with a specific location.
-// Changing the location in this way changes only the presentation; it does not
-// change the instant in time being denoted and therefore does not affect the
-// computations described in earlier paragraphs.
+// Each time has an associated Location. The methods Local, UTC, and In return a
+// Time with a specific Location. Changing the Location of a Time value with
+// these methods does not change the actual instant it represents, only the time
+// zone in which to interpret it.
+
 //
 // Representations of a Time value saved by the GobEncode, MarshalBinary,
 // MarshalJSON, and MarshalText methods store the Time.Location's offset, but not
@@ -951,6 +950,15 @@ func Until(t Time) Duration {
 // For example, AddDate(-1, 2, 3) applied to January 1, 2011
 // returns March 4, 2010.
 //
+// Note that dates are fundamentally coupled to timezones, and calendrical
+// periods like days don't have fixed durations. AddDate uses the Location of
+// the Time value to determine these durations. That means that the same
+// AddDate arguments can produce a different shift in absolute time depending on
+// the base Time value and its Location. For example, AddDate(0, 0, 1) applied
+// to 12:00 on March 27 always returns 12:00 on March 28. At some locations and
+// in some years this is a 24 hour shift. In others it's a 23 hour shift due to
+// daylight savings time transitions.
+//
 // AddDate normalizes its result in the same way that Date does,
 // so, for example, adding one month to October 31 yields
 // December 1, the normalized form for November 31.
diff --git a/src/time/zoneinfo.go b/src/time/zoneinfo.go
index 42d40d584e..c8d1762302 100644
--- a/src/time/zoneinfo.go
+++ b/src/time/zoneinfo.go
@@ -16,6 +16,10 @@ import (
 // Typically, the Location represents the collection of time offsets
 // in use in a geographical area. For many Locations the time offset varies
 // depending on whether daylight savings time is in use at the time instant.
+//
+// Location is used to provide a time zone in a printed Time value and for
+// calculations involving intervals that may cross daylight savings time
+// boundaries.
 type Location struct {
 	name string
 	zone []zone