How to enter a time of day

[Peter Haworth]

I have a need for users to enter a start and end time of an event and  
I'm  trying to come up with a graphical way for them to do that to  
ensure that the time is in the correct format.

What appeals to me the most is to use some sort of slider that would  
increment/decrement the time of day in 15 minute intervals.  I was  
hoping the rev slider control would be the answer to it but it only  
seems to deal with whole numbers on its scale, haven't been able to  
figure out how to deal with time-based numbers.

Any recommendations on how to set about implementing this?

Pete Haworth