>Start Time, Current Time, Estimated Completion Time display to a user importing data. It is not an all day deal [maybe 90 minutes max] so the date is superfluous.

I would leave the date in, it doesn't hurt anything, and what if you go from 23.30 to 0.45 or something? Then its required.

Otherwise, you'd probably want to write some reuasble methods that convert and revert times to only seconds and back.