How to increment a user defined date value in the DATE format itself using shell script?

I need to increment a date value through shell script.
Input value consist of start date and end date in DATE format of unix.
For eg.
I need increment a date value of 1/1/09 to 31/12/09 i.e for a whole yr.
The output must look like

1/1/09
2/2/09
.
.
.
31/1/09
.
.
1/2/09
.
28/2/09
.
.
31/12/09

Please provide me a suitable solution for this in shell script.I m finding difficulty in incrementing with date function.

This question is asked almost every day. Please use the forums search facility. In the FAQ you will find Perderabo's DateCalc script.