Add and subtract hours, minutes, second, frames. You can set frames per second. This app helps you do math with time. For example you can enter: 30 minutes + 55 minutes. And get the result: 1 hours 15 minutes. Adding. Another adding example: 4 hours 30 minutes + 5 hours 45 minutes. Yields: 10 hours 15 minutes. Normalizing. You can normalize a time too.