I would like to give a variable for my date column, can some one advise me

Example:
I have column in this formate mmm/yy, my below variable should identify the
Month & Year, i need to variables one is for current month(Jan/09), and the
other for Previous Month(Dec/08)

CurrMth = Month(Today()) & Year(Today())
PrvMth = Month(Today()) - 1 & Year(Today())