From 3b66de32f47f31ad66891eab9c91daf17410f3eb Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Thu, 4 Dec 2025 16:41:45 -0500
Subject: [PATCH] libroot/strftime: Add support for %k and %l.

These aren't in POSIX but glibc and FreeBSD support them,
and our ICUTimeData class expects that strftime will handle them.

Fixes #18471 and some of the problems described in #14356.
---
 src/system/libroot/posix/musl/time/strftime.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/system/libroot/posix/musl/time/strftime.c b/src/system/libroot/posix/musl/time/strftime.c
index 87c2ca5f43..5bf777f56c 100644
--- a/src/system/libroot/posix/musl/time/strftime.c
+++ b/src/system/libroot/posix/musl/time/strftime.c
@@ -95,9 +95,19 @@ const char *__strftime_fmt_1(char (*s)[100], size_t *l, int f, const struct tm *
 		if (f=='g') val %= 100;
 		else width = 4;
 		goto number;
+#ifdef __HAIKU__
+	case 'k':
+		def_pad = '_';
+		// fallthrough
+#endif
 	case 'H':
 		val = tm->tm_hour;
 		goto number;
+#ifdef __HAIKU__
+	case 'l':
+		def_pad = '_';
+		// fallthrough
+#endif
 	case 'I':
 		val = tm->tm_hour;
 		if (!val) val = 12;