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time: show how to get midnight on the current day

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A common task is trying to get today's date in the local time zone
with zero values for the hour, minute, second, and nanosecond fields.
I tried this recently and incorrectly used Truncate(24*time.Hour),
which truncates based on a UTC clock, and gave me 5pm Pacific time
instead of midnight Pacific.

I thought it would be helpful to show a "correct" way to do this.

Change-Id: I479e6b0cc56367068530981ca69882b34febf945
Reviewed-on: https://go-review.googlesource.com/46833
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Kevin Burke 2017-06-27 11:36:32 -07:00
parent 4e9c86ab8e
commit e1ced32195
1 changed files with 3 additions and 0 deletions
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3
src/time/example_test.go
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@ -256,6 +256,9 @@ func ExampleTime_Truncate() {
for _, d := range trunc {
fmt.Printf("t.Truncate(%5s) = %s\n", d, t.Truncate(d).Format("15:04:05.999999999"))
}
// To round to the last midnight in the local timezone, create a new Date.
midnight := time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, time.Local)
_ = midnight
// Output:
// t.Truncate( 1ns) = 12:15:30.918273645