Time Calc calculates numbers, durations and dates.

It's convenient if you want to:
- Figure out play time of several music tracks
- Report how many hours you've worked total
- Find out your flight duration by subtracting departure time from arrival time (time zone suppoted)
- Find out expiration dates

Time Calc can do the following arithmetic.
Number + Number
Number - Number
Number * Number
Number / Number
Duration * Number = Duration
Duration / Number = Duration
Duration + Duration
Duration - Duration
Duration / Duration = Number
Date + Duration = Date
Date - Duration = Date
Date - Date = Duration
Number / Duration = Number per unit duration

M+ & M- keys to add/subtract what's in the memory.
Tap = (equal) key to change units from sec, min, hour, week.
Tap # key to drop unit. e.g. 1.5 days becomes 1.5