extract just the time from a date time field

Looking for a function that will extract just the time from a date time field.

Example:

02/19/2004 12:05:32

I tried to use trim-trailing but it wont' let me do it on a date field. I want to extract just 12:05:32

Thanks! Received on Fri Mar 12 2004 - 10:42:53 CST