Use the NEWDATE function to return a date that can be used for comparison. There is also a TIMEDIFF function, but that probably doesn't help you. Search the Help files in Report Designer for the proper format for use of these functions. 

Thanks,

NEWDATE doesn't seem to work with time (as opposed to date) values. I tried using TIMEDIFF  but have the same problem, getting it to accept a constant time value. "Help" doesn't help much as far as that goes.

I'm trying to filter for date/time stamps on transactions, (e.g.  DateStamp = 022319 AND TimeStamp > 14:30:00). The value for DateStamp is accepted but I can't get obvious format to work for the TimeStamp.

You can you use conditions because they will allow you to do 2 conditions: 1. "Date Stamp" & "Equal to"  and "Time Stamp" & "Greater than" while handling the formatting issue.

That's exactly what I'm trying to do but the Time Stamp condition will not accept a constant in any format I can come up with.

14:30 doesn't work

14:30:00 doesn't work

143000 doesn't work

14-30-00 doesn't work.

I can use a Prompt Field to provide the Time parameter but for my purposes a constant is more desirable.

I just tried and setup the conditions based on "Prompt fields" where the date is prefilled with the system date and the time is prefilled with the system time.  That way I could see the format for the time and in my test it was 14:30:00.  I think there can be a couple of ways you could format the prompt field for time, so using the prompt field formatted as time should help you figure out which is the correct format.