how to know date information ?

Hi all,
I want to know date information on unix about 105th day's date from today's date.

GNU date has a -d option which allows you to specify a relative date.

vnix$ date -d "105 days"
Sun Nov 16 10:07:02 EET 2008

The default date available on HP-UX is less capable I believe, but the GNU coreutils package is just a download away. Or search this site for other workarounds; there are multiple threads about date calculation on HP-UX, including I believe something in the FAQ section.

Since this thread appears in the HP-UX section
I would think GNU date isn't an option here.
If your HP-UX isn't too dated though chances are that you have a decent Perl available.
So you could ask Perl what date it is in 105 days from today.

$ uname -srv; perl -le 'print scalar localtime(time+105*86400)'
HP-UX B.11.11 U
Tue Nov 18 08:58:51 2008