Date T Calc

I needed an app to tell me how many hours & minutes between one date, hh mm and another date, hh mm. This works just fine for that. I then need to add X hours and minutes to a date, hh mm. This app does that fine as well. The description of the app doesn't make it clear, but you can subtract dates/times as easily as add. It's quick and easy. I'd give it 5-stars if it had more features (like multiply/divide time and the ability to turn on/off dst changes). I was very hesitant to spend the money without reading anyone's review, but I'm glad I did. Been looking for this type of app for a long time.