Delete Identical but Keep the most recent

Hello,
I receive data once a week from a third party vendor. There are 2 fields in which I wish to use to exclude duplicate.
rig_number, and a date field. Currently my script look like this. (standard delete identical code).


arcpy.DeleteIdentical_management(rigsFc,rig_number)

The thing is that I only care about the most recent one and this process seems to select one at random to keep. Is their a way to use delete identical but keep the attribute with the most current date?

Im using python 2.6 and arcMap 10.0

Thanks