Macro to Auto hide certain rows in a calendar or Time Sheet.

Hi,
I am trying to create a Driver's Overtime Sheet. I want to select any month in cell C2 & the relevant dates are filled in the subsequent 31 rows. But the problem is that in case of February, April etc. (Months having <=30 days), some dates of the next month are displayed. I want a macro to automatically hide that/those rows when the month is changed in cell C2 (most probably with a worksheet change event).
Any help is highly appreciated.
Thanks in advance.