I'm pretty sure you can use CURRENT DATE-TIME or CURRENT DATE/TIME as properties, so you could write a condition such as:
[CASE_X_DATE] < [CURRENT DATE-TIME]
which would resolve to
12/12/2007 10:11:12 AM < 12/13/2007 11:22:34 AM
But those properties would be date and time. This works great if using ''>'' or ''<'' ...
