DateCalc

Add and subtract dates and time with this date calculator. Useful for looking up how long ago a date was, or how many days between dates. The app has 3 different types of calculations on dates and time... 1. The first is date subtraction. If you want to find out out how many time past between 2 dates, use date subtraction (For example, 1 month, 5 days and 1 minute = how far apart Feb. 9 at 9:20 PM and March 14 at 9:21 PM are) 2. The second is adding time to dates. 
If you want to add a set amount of months or days to a date, you can find out what date that will be. 
(For example, March 14 + 2 weeks - 1 day = March 27) 3. The third calculation this app can do is adding and subtracting months, weeks, days, etc.
 If you want to know exactly how much time a week is minus 1 hour, you can use that mode
 (For example, 1 week minus 1 hour = 6 days and 23 hours)