Formula for multiple criteria on 2 worksheets
 

I have two worksheets. I would like to have a formula that counts data
according to the following conditions.

Worksheet 1
A B C
02/15/2009 Keyword Keyword
01/14/2009 Keyword Keyword
01/31/2009 Keyword Keyword

Worksheet 2
A B C
January Total Keyword Total Keyword
February Total Keyword Total Keyword

I would like staff to be able to enter data into Worksheet 1 and have
Worksheet 2 automatically count the occurrences of the keyword in the given
month (January or February, etc.).