Hey ! i was just trying to make a simple timer

.In which when we type /lotto its starts a countdown to 0 from 5 mins and if we type /results it displays the type left for it to end.
I am a getting a problem. When the timer reaches "4 Minutes and 0 Secs" after that it displays time like "-1 , -60" and weird stuff.I want it to display "3 Minutes and 59 secs" and then continue to till "0 minutes and 0 secs"