From e1ced3219506938daf404bb2373333cd3352f350 Mon Sep 17 00:00:00 2001 From: Kevin Burke Date: Tue, 27 Jun 2017 11:36:32 -0700 Subject: [PATCH] time: show how to get midnight on the current day 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 Run-TryBot: Ian Lance Taylor TryBot-Result: Gobot Gobot --- src/time/example_test.go | 3 +++ 1 file changed, 3 insertions(+) diff --git a/src/time/example_test.go b/src/time/example_test.go index 7dc2bb5e7e..aeb63caa55 100644 --- a/src/time/example_test.go +++ b/src/time/example_test.go @@ -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 -- 2.50.0