From 5d979e313177cbe023e15a958a8dd7261f49402b Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Tue, 14 Apr 2026 12:45:23 +0300
Subject: [PATCH] =?UTF-8?q?time:=20Performance=20Issues=20with=20time.now?=
 =?UTF-8?q?=EF=BC=9F=20(fixes=20#19554)?=
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---
 vlib/time/time_darwin.c.v  |  2 +-
 vlib/time/time_nix.c.v     | 20 ++++++++++++++++++--
 vlib/time/time_solaris.c.v |  2 +-
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/vlib/time/time_darwin.c.v b/vlib/time/time_darwin.c.v
index 949c16623..14466e4b3 100644
--- a/vlib/time/time_darwin.c.v
+++ b/vlib/time/time_darwin.c.v
@@ -64,7 +64,7 @@ fn darwin_now() Time {
 	nsec := int(epoch_ns % i64(second))
 	loc_tm := C.tm{}
 	C.localtime_r(voidptr(&sec), &loc_tm)
-	return convert_ctime(loc_tm, nsec)
+	return convert_ctime_with_unix(loc_tm, nsec, sec + i64(loc_tm.tm_gmtoff))
 }
 
 // darwin_utc returns a better precision current time for macos
diff --git a/vlib/time/time_nix.c.v b/vlib/time/time_nix.c.v
index ee1ed4058..73ef85531 100644
--- a/vlib/time/time_nix.c.v
+++ b/vlib/time/time_nix.c.v
@@ -31,6 +31,22 @@ fn make_unix_time(t C.tm) i64 {
 	return unsafe { i64(C.timegm(&t)) }
 }
 
+// localtime_r already resolves the local UTC offset, so callers can reuse it.
+@[inline]
+fn convert_ctime_with_unix(t C.tm, nanosecond int, unix i64) Time {
+	return Time{
+		year:       t.tm_year + 1900
+		month:      t.tm_mon + 1
+		day:        t.tm_mday
+		hour:       t.tm_hour
+		minute:     t.tm_min
+		second:     t.tm_sec
+		nanosecond: nanosecond
+		unix:       unix
+		is_local:   true
+	}
+}
+
 // local returns t with the location set to local time.
 pub fn (t Time) local() Time {
 	if t.is_local {
@@ -39,7 +55,7 @@ pub fn (t Time) local() Time {
 	loc_tm := C.tm{}
 	t_ := t.unix()
 	C.localtime_r(voidptr(&t_), &loc_tm)
-	return convert_ctime(loc_tm, t.nanosecond)
+	return convert_ctime_with_unix(loc_tm, t.nanosecond, t_ + i64(loc_tm.tm_gmtoff))
 }
 
 // in most systems, these are __quad_t, which is an i64
@@ -86,7 +102,7 @@ fn linux_now() Time {
 	C.clock_gettime(C.CLOCK_REALTIME, &ts)
 	loc_tm := C.tm{}
 	C.localtime_r(voidptr(&ts.tv_sec), &loc_tm)
-	return convert_ctime(loc_tm, int(ts.tv_nsec))
+	return convert_ctime_with_unix(loc_tm, int(ts.tv_nsec), i64(ts.tv_sec) + i64(loc_tm.tm_gmtoff))
 }
 
 fn linux_utc() Time {
diff --git a/vlib/time/time_solaris.c.v b/vlib/time/time_solaris.c.v
index c97735951..b07e35960 100644
--- a/vlib/time/time_solaris.c.v
+++ b/vlib/time/time_solaris.c.v
@@ -10,7 +10,7 @@ fn solaris_now() Time {
 	C.clock_gettime(C.CLOCK_REALTIME, &ts)
 	loc_tm := C.tm{}
 	C.localtime_r(voidptr(&ts.tv_sec), &loc_tm)
-	return convert_ctime(loc_tm, int(ts.tv_nsec))
+	return convert_ctime_with_unix(loc_tm, int(ts.tv_nsec), i64(ts.tv_sec) + i64(loc_tm.tm_gmtoff))
 }
 
 fn solaris_utc() Time {
-- 
2.39.5