去时间比较

Question

I'm trying to create simple function just to change time zone of a time to another (Lets assume UTC to +0700 WIB). Here is the source code. I have 2 functions, first GenerateWIB which will change just your time zone into +0700 WIB with same datetime. Second is GenerateUTC which will change given time's timezone into UTC. GenerateUTC works perfectly while another is not.

expect := time.Date(2016, 12, 12, 1, 2, 3, 4, wib)
t1 := time.Date(2016, 12, 12, 1, 2, 3, 4, time.UTC)
res := GenerateWIB(t1)
if res != expect {
    fmt.Printf("WIB Expect %+v, but get %+v", expect, res)
}

The res != expect always fullfilled with this result.

WIB Expect 2016-12-12 01:02:03.000000004 +0700 WIB, but get 2016-12-12 01:02:03.000000004 +0700 WIB

But it is the same time right? Did i miss something?

Answer 1

There is an .Equal() method to compare dates :

if !res.Equal(expect) {
   ...

---

Quoting the doc :

Note that the Go == operator compares not just the time instant but also the Location and the monotonic clock reading. 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, and that the monotonic clock reading has been stripped by setting t = t.Round(0). In general, prefer t.Equal(u) to t == u, since t.Equal uses the most accurate comparison available and correctly handles the case when only one of its arguments has a monotonic clock reading.

If you look at the code for the time.Time struct, you can see that this struct has three private fields :

type Time struct {
    ...
    wall uint64
    ext  int64

    ...
    loc *Location
}

and the comments about those fields clearly indicate that, depending on how the Time struct was built, two Time describing the same point in time may have different values for these fields.

Running res == expect compares the values of these inner fields,
running res.Equal(expect) tries to do the thing you expect.