Solaris

I have script where in i issue a command to get back 6 month earlier date.
below command works on all linux distribution.

Code:

#  date +%Y-%m-%d --date="2012-03-31 - 183 days ago"
2011-09-30

Is there any solaris equivalent command to do the same?

FWIW I ran that command and got different output:

If you're able to get this to work with the GNU version of date, the stock "Solaris community" response is "compile it and install the GNU version."

If that's not an option, my understanding of what you're trying to get at is to calculate the date of an arbitrary number of days in the past? Basically there's no way you can do it with Solaris's date command and there's no other stock command (other than cal) that really deals with dates. But fret not this shell function should do something similar to what you're wanting (assuming perl is installed, which it should be):

That's pretty crude but it should be pretty obvious where you want to take it from there.

- Joel