Python module for freerunning counter

I want to create a python game. In this game I want to implement something like a stopwatch(not a backwards counter). Specifically I want to be able to set the minutes and seconds the counter start at: say 00:00 or 10:35, etc and then when I press a button I want the program to keep counting untill I make it stop or untill it reaches 98:59. Is there a python module which does exactly that? Or do I need to write some logic starting from a module such as time or datetime?