You would have to identify the timepicker you want to use, then you could use it. There is of course a way, but it would be a matter of following the implementation directions included with the timepicker you use. 
Hi Ray,
I have found this plug-in (http://trentrichardson.com/examples/timepicker/) and it works great.
This should be implemented by default when you set a datetime field. I would consider this for a future implementation in WA.
Hope it helps other.
Ciao
Tony


