I want a formula that can check on a date such as 1/1/2010 and return all the
work days for January for example.

I used:
=WORKDAY(DATE(YEAR($A$1),MONTH($A$1)+1,1),-21)
and then in the cell below it:
=WORKDAY(DATE(YEAR($A$1),MONTH($A$1)+1,1),-20)
and on down to get all the days listed.

However I need some kind of check on the month I am pulling the date from so
it does not go over into the previous or following month depending on how
many days in a month.