Just enter the Start time and the End time and the total time between them is displayed.
Update Description:
FROM v0.9.1 (released 4/30/2004):
Fixed Bugs:
- Corrected the Valid-Times-Only feature to allow times from ##:06 through ##:09.
- Fixed some memory leaks.
Features Added:
- "How To Use" info-button on the "About" window.
- Clear and Reset buttons.
- Time-To-Subtract checkbox and fields.