Is "01:45" one minute and 45 seconds, or one hour and 45 minutes? I wonder because "60:00", if it were minutes and seconds, should probably have been "1:00:00".

Apart from that, the next time you post a question like this, show us some code that you have tried. If all you give us is "I am currently losing some minutes", all we can say is "well, where were they when you last saw them? Have you checked all your pockets?"

(For that matter, if you're still having trouble with this problem, you can post some code so we can help you look for those missing minutes.)