Fm to get the previous date by month from the current date

Hi,

my requirement is , like I need to find back date from current date using no of months.

e.g say if I enter 4 months, then it should give me , if current date is 5th Jun 2009.

then 5th Jun - 4 months so it should give me date as 5th Feb 2009. it should alos give me all the dates in between 5th feb and 5th Jun. (range of dates)

is there any FM for this?

Regards,

Mrunal