time: replace time.Now().Sub call with time.Since in test
Change-Id: I56ca2d11637d60c6b0656fdc1d900a2384aba141
GitHub-Last-Rev:
686e02db77797fd81aafcde8ae40c85cee8dd817
GitHub-Pull-Request: golang/go#66264
Reviewed-on: https://go-review.googlesource.com/c/go/+/570916
Reviewed-by: qiulaidongfeng <2645477756@qq.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>