Clockwise
Either enter a time and see it displayed on the analogue clock, or click on 'Random' and type in the time shown on the clock. There are three difficulty levels.
http://www.shodor.org/interactivate/activities/ClockWise/

Elapsed Time
Practice finding elapsed time given a starting time and an ending time.
http://www.shodor.org/interactivate/activities/ElapsedTime/