Automatically get all the dates of a month, entering specific year and month

In a sheet I enter the following:
... in A1 a year (say 2012)
... in A2 a month, formatting as "MMM" (JAN, FEB, MAR etc.)

How to automatically get in column A (say from A3) all the dates of the month entered, formatting as "D/M/YYYY" (e.g. 1/1/2012, 2/1/2012/ 3/1/2012, etc.)?
Thanks in advance