YOUR request is a bit ambiguous.
Do you want dates that are:
between today's date and two months in the past;
between today's date and two months in the future;
between two months in the past and two months in the future;
after two months in the past;
before two months in the past;
or something else?
Any date that occurs after two months ago
Field: SomeDate
Criteria: >DateDiff("m",-2,Date())