Submitted upstream:

  <https://gitlab.gnome.org/GNOME/gnome-system-monitor/-/merge_requests/67>

Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon Feb 6 08:36:22 2023 +0100

    meson: Remove unused ctime_r check
    
    It did not work because of an implicit function declaration
    (<time.h> does not declare ctime_r due to -std=c11, which disables
    GNU extensions).  The only use of CTIME_R_THREE_ARGS was #if'ed out,
    so remove that as well.

diff --git a/meson.build b/meson.build
index a314a684b2a9ceb4..985a361a60b08240 100644
--- a/meson.build
+++ b/meson.build
@@ -105,16 +105,6 @@ add_project_arguments(cx.get_supported_arguments(cxxflags),
 
 conf.set('HAVE_LKSTRFTIME', cc.has_function('strftime'))
 
-conf.set('CTIME_R_THREE_ARGS', cc.compiles('''
-#include <time.h>
-int main() {
-  char *buf;
-  time_t date;
-  ctime_r (&date, buf, 100);
-}
-'''))
-
-
 configure_file(
   output: 'config.h',
   configuration: conf,
diff --git a/src/legacy/e_date.c b/src/legacy/e_date.c
index 2697e892c7463357..71d0b5214b6d15cf 100644
--- a/src/legacy/e_date.c
+++ b/src/legacy/e_date.c
@@ -194,13 +194,6 @@ filter_date (time_t date)
             e_utf8_strftime_fix_am_pm (buf, 26, _("%b %d %Y"), &then);
         }
     }
-#if 0
-#ifdef CTIME_R_THREE_ARGS
-    ctime_r (&date, buf, 26);
-#else
-    ctime_r (&date, buf);
-#endif
-#endif
 
     return g_strdup (buf);
 }