diff -uNr coreutils-9.4/src/date.c coreutils-9.4.mod/src/date.c
--- coreutils-9.4/src/date.c	2023-07-05 12:09:55.000000000 +0100
+++ coreutils-9.4.mod/src/date.c	2023-09-12 18:13:27.556340784 +0100
@@ -633,6 +633,10 @@
 
       if (set_date)
         {
+          if (getuid() != 0)
+            {
+              error (EXIT_FAILURE, 0, "only root user can change date/time");
+            }
           /* Set the system clock to the specified date, then regardless of
              the success of that operation, format and print that date.  */
           if (settime (&when) != 0)