Question : Formula to return Month and Year when subtracting from a start date.

Can anyone help?
Using Excel 2003. I wish to enter the Month and Year into each cell down a column.
I 'm starting with a know date, eg Aug10.
I wish to return using the know date every month and year for the previous 3 years, using a formula. eg.
Aug10,
 Jul10,
 Jun10,
 May10,
 Apr10,
 etc.
I have used the date minus 30 days but this returns errors when months have 28 days, or 31 days.

Answer : Formula to return Month and Year when subtracting from a start date.

If Aug-10 is in A1, try this

=DATE(YEAR(A1),MONTH(A1)-1,1)