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-rw-r--r--src/time/time.go5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/time/time.go b/src/time/time.go
index 4f76d79ee..0300e846a 100644
--- a/src/time/time.go
+++ b/src/time/time.go
@@ -31,6 +31,11 @@ import "errors"
// change the instant in time being denoted and therefore does not affect the
// computations described in earlier paragraphs.
//
+// Note that the Go == operator compares not just the time instant but also the
+// Location. Therefore, Time values should not be used as map or database keys
+// without first guaranteeing that the identical Location has been set for all
+// values, which can be achieved through use of the UTC or Local method.
+//
type Time struct {
// sec gives the number of seconds elapsed since
// January 1, year 1 00:00:00 UTC.