Patch from Fillod Stephane:

* The "rdate.patch" file makes rdate to NOT settimeofday if the date to be
set equals current date. This prevents the system from experiencing nasty time
discontinuities caused by sub-second changes, with a protocol that has only
over second resolution. Depending on your taste, the "fprintf(stderr..." may be
removed.

util-linux/rdate.c

@@ -103,6 +103,12 @@ int rdate_main(int argc, char **argv)
 	remote_time = askremotedate(argv[optind]);
 
 	if (setdate) {
+		time_t current_time;
+
+		time(&current_time);
+		if (current_time == remote_time)
+			bb_error_msg("Current time matches remote time.");
+		else
 			if (stime(&remote_time) < 0)
 				bb_perror_msg_and_die("Could not set time of day");
 	}