From: Ian Lance Taylor <iant@golang.org>
Date: Tue, 19 Jul 2022 22:09:21 +0000 (-0700)
Subject: time: add comment explaining >>33 in Now
X-Git-Tag: go1.20rc1~875
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=2c4c2a5106e16a2ef51e3fc1d846e5d75d7ee6cc;p=gostls13.git

time: add comment explaining >>33 in Now

Change-Id: I022b617cd345b412bee0b50a862676a1dca94e01
Reviewed-on: https://go-review.googlesource.com/c/go/+/418376
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
---

diff --git a/src/time/time.go b/src/time/time.go
index 0cd7a7e8a2..5da61510c1 100644
--- a/src/time/time.go
+++ b/src/time/time.go
@@ -1112,6 +1112,9 @@ func Now() Time {
 	mono -= startNano
 	sec += unixToInternal - minWall
 	if uint64(sec)>>33 != 0 {
+		// Seconds field overflowed the 33 bits available when
+		// storing a monotonic time. This will be true after
+		// March 16, 2157.
 		return Time{uint64(nsec), sec + minWall, Local}
 	}
 	return Time{hasMonotonic | uint64(sec)<<nsecShift | uint64(nsec), mono, Local}