Now compensation hack should work.

simpleclock.ino

@@ -130,8 +130,7 @@ void loop()
 
 	if ((clock.hour == 21) and (clock.minute == 21) and
 	    (clock.second == 21) and (compflag == 0)) {
-		clock.second = 14;
-		clock.fillByHMS(clock.hour, clock.minute, clock.second);
+		clock.fillByHMS(clock.hour, clock.minute, 14);
 		clock.setTime();
 		compflag = 1;
 	}