We have an employee time sheet, where they enter their in/out times. We pay
based on a 15-minute increment scale. I need them to be able to enter the
actual time, but have it convert to the correct 15-minute base:

For example:
7:53-8:07 = 8:00
8:08-8:22 = 8:15
8:23-8:37 = 8:30
8:38-8:52 = 8:45 and so on.

Help! and Thanks!