Aaahh, that makes total sense, thank you so much!
On Fri, Nov 11, 2016, 11:59 PM Jakob Borg <ja...@nym.se> wrote:
> You are dividing the number of nanoseconds since the Unix epoch by some
> random number of nanoseconds and chopping off the remainder. But a
> time.Time internally is an interval since another, much earlier, reference
> time. The remainder in that division will be different.
>
> //jb
>
> On 11 Nov 2016, at 15:53, Brian Picciano <mediocregop...@gmail.com> wrote:
>
> Here's a test case to show what I mean:
>
> func TestWat(t *T) {
> now := time.Now()
> trunc := rand.Int63n(int64(time.Second))
> t.Logf("trunc: %v", trunc)
>
> t1 := now.Truncate(time.Duration(trunc))
> t2 := time.Unix(0, trunc*(now.UnixNano()/trunc))
>
> // this fails for some reason
> assert.Equal(t, t1, t2)
> }
>
> For t2 I'm dividing the unix nano timestamp by the truncation, then
> multiplying by the truncation, effectively just removing the remainder. I
> would expect that this is what Truncate is doing as well, but this
> assertion fails by a couple milliseconds each time.
>
> --- FAIL: TestWat (0.00s)
> tpart_test.go:23: trunc: 947779410
> Error Trace: tpart_test.go:29
> Error: Not equal: time.Time{sec:63614472718,
> nsec:711160820, loc:(*time.Location)(0x7bb700)} (expected)
> != time.Time{sec:63614472719,
> nsec:157822750, loc:(*time.Location)(0x7bb700)} (actual)
>
> Diff:
> --- Expected
> +++ Actual
> @@ -1,2 +1,2 @@
> -(time.Time) 2016-11-11 07:51:58.71116082 -0700 MST
> +(time.Time) 2016-11-11 07:51:59.15782275 -0700 MST
>
>
> Does anyone know what accounts for this difference? NOTE I'm not saying
> this is a bug with Truncate, I'm just wondering what all Truncate is doing
> that I'm not expecting it to be doing. Thanks!
>
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