This is what i want to do...

Im making an mp3 player, and i use the current position * the total length of the song divided by 100 which gives me the number it would be on. But the numbers are like 97.34 , and i just wanted to know how i could just convert that to 01:37. I tried all sorts of stuff, but what I tried didnt work for me. Any suggestions? (if you are going to say , just run a timer that counts how long the song has been playing, i dont want to do that because if the user fastforwards or rewinds in the song, it will be totally off.)