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| author | baycore <dxasu@qq.com> | 2025-10-27 04:43:32 +0000 |
|---|---|---|
| committer | Keith Randall <khr@google.com> | 2025-10-27 09:44:55 -0700 |
| commit | 189f2c08cc769fdc98d28ec536010b6f119e645f (patch) | |
| tree | c3fdcfc792efee12fd29f2b910951cd1900baa00 /src/time | |
| parent | f619b4a00d6a7ce2fbb84729cdfe764697cb2171 (diff) | |
| download | go-189f2c08cc769fdc98d28ec536010b6f119e645f.tar.xz | |
time: rewrite IsZero method to use wall and ext fields
Using wall and ext fields will be more efficient.
Fixes #76001
Change-Id: If2b9f597562e0d0d3f8ab300556fa559926480a0
GitHub-Last-Rev: 4a91948413079047cb6c382ed29844f456f3064d
GitHub-Pull-Request: golang/go#76006
Reviewed-on: https://go-review.googlesource.com/c/go/+/713720
Reviewed-by: Ian Lance Taylor <iant@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: David Chase <drchase@google.com>
Diffstat (limited to 'src/time')
| -rw-r--r-- | src/time/time.go | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/time/time.go b/src/time/time.go index cf9abc7196..32a1ce4307 100644 --- a/src/time/time.go +++ b/src/time/time.go @@ -260,7 +260,11 @@ func (t *Time) mono() int64 { // IsZero reports whether t represents the zero time instant, // January 1, year 1, 00:00:00 UTC. func (t Time) IsZero() bool { - return t.sec() == 0 && t.nsec() == 0 + // If hasMonotonic is set in t.wall, then the time can't be before 1885, so it can't be the year 1. + // If hasMonotonic is zero, then all the bits in wall other than the nanoseconds field should be 0. + // So if there are no nanoseconds then t.wall == 0, and if there are no seconds then t.ext == 0. + // This is equivalent to t.sec() == 0 && t.nsec() == 0, but is more efficient. + return t.wall == 0 && t.ext == 0 } // After reports whether the time instant t is after u. |