Thanks for all ur inputs.

Looks like i have not state my requirement clearly.
I am aware of
date --date='next day' "+%Y%m%d" .
This will give next date of the unix system date as an output in YYYY/mm/dd format.

But what i am looking is to get the next day or next month for any date which the user is passing as a parameter.

something like this below

mydate=$1
date --date $mydate +%m%d%Y -d ýesterday (this does not work)

but i want next day or 3rd day of mydate

Is it possible ? if so pls give me the soln.

Thks