在知道UTC时间和时间偏移时如何设置Go时间区域的值？

Question

I have an UTC time and a time offset in seconds, and need to return the corresponding Go time value.

It is trivial to instantiate the UTC time value by using the time.Unix() function. But to set the Zone, I need to determine the time.Location.

How can I find the time.Location when knowing the UTC time and time offset ?

Answer 1

Without an actual entry to lookup in the time zone database, you can't know the true location for the time. If you want to work with just an offset, you can create a fixed location using time.FixedZone

edt := time.FixedZone("EDT", -60*60*4)
t, _ := time.ParseInLocation("02 Jan 06 15:04", "15 Sep 17 14:55", edt)
fmt.Println(t)

// 2017-09-15 14:55:00 -0400 EDT

You can opt to specify a non-existent zone name, or none at all, as long as the output format you use doesn't require one.

minus4 := time.FixedZone("", -60*60*4)
t, _ = time.ParseInLocation("02 Jan 06 15:04", "15 Sep 17 14:55", minus4)
fmt.Println(t.Format(time.RFC3339))

// 2017-09-15T14:55:00-04:00