Utility for measuring time intervals between two dates and/or times.

Just give Date Difference two dates and/or times, and it tells you the length of time between them. There are preferences for what units to enable or disable (days, hours, minutes, and/or seconds), and it compensates for the disabled units with the next largest enabled unit (for example, if the difference between the dates is 1 day and 2 hours, but you disable days, then it becomes 26 hours).

Planned features for future versions include support for weeks, months, and years, as well as possibly iCal integration, as well as porting it to the iPhone (as soon as I get my developer membership).