Does your employer require you to track how many hours you took off in the past 45 days? Or the past 12 months? Perhaps you just want to track how many hours of TV you watched in the past week.
Rolling Calendar lets you track your time down to the minute, and will present how many hours and minutes it adds up to in the past X number of days or months.
The app will also let you track what you used that time for. Go back through the calendar view and edit time you input in the past (or forgot to input!).