From 68251761c77b2f5ff927cf19bba7d4efa88799de Mon Sep 17 00:00:00 2001
From: Robert Clausecker <fuz@FreeBSD.org>
Date: Thu, 14 May 2026 12:24:30 +0200
Subject: [PATCH] libc/ctime.3: timegm() is in C23.

See also:	D53951, https://wiki.freebsd.org/C23
MFC after:	1 week
---
 lib/libc/stdtime/ctime.3 | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/libc/stdtime/ctime.3 b/lib/libc/stdtime/ctime.3
index 6384e8bd959..e51cb5d52f9 100644
--- a/lib/libc/stdtime/ctime.3
+++ b/lib/libc/stdtime/ctime.3
@@ -27,7 +27,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd September 23, 2025
+.Dd May 14, 2026
 .Dt CTIME 3
 .Os
 .Sh NAME
@@ -354,8 +354,9 @@ table).
 .Pp
 The
 .Fn timegm
-function is not specified by any standard; its function cannot be
-completely emulated using the standard functions described above.
+function is expected to conform to
+.St -isoC-2023
+with the same constraint.
 .Sh HISTORY
 This manual page is derived from
 the time package contributed to Berkeley by