For list or table view the following technique is the same.
If you use United States date formats MM/DD/YYYY
Simply enter find mode and enter Month/Year as your criteria. 2/2010 would find all records in the month of February, 2010 for example.
If you don't use the above format, you can set up a "month" calculation that returns the first day of the month date for all dates of the same month:
cMonth : YourDateField - Day ( YourDateField ) + 1 /* set this to return "Date" as the return type */
You can then perform a find on this field to find all dates from the same month and year.