[Dxbase] QSL Card Design - Test for Previous Date?

[Eric - VE3GSI]

Using the QSL card design module, does anyone know if it is possible to test
for a date previous to a certain date or do I have to use the date range
condition? 

Reason, we moved to a new QTH in a different county, grid square and Town on
August 21rst of this year. For the cards prior to that date I wish to
indicate the old county, grid and town. Cards from here on will use my new
QTH details.

I don't wish to reinvent 'the wheel' if someone has already wrote a
conditional test for dates.

TNX,
Eric - VE3GSI
Read Ontario