iuTime is a free utility from UNI Technologies Corporation, that allows you to perform time and date calculations (subtractions, additions, etc. between multiple dates).
Official Site Requires: MacOS X 10.2.7
* [new] Preference to open a particular tab at application startup.
* [new] Preference to set a particular date and time format for certain fields.
* [new] Window location is remembered for next application launch.
* [new] Ability to play a tick sound for each second, and a chime on the minute.