UNIX for Dummies Questions & Answers

Hi,

Could you please let me know the command to change my date /time beyond few days back. Currently when i am trying the below commands able to go beyond one day at max.

-->date
-->Mon Sep 29 19:31:58 EST 2008
-->export TZ=TMP40:00:00 (Changing the date beyond 40 hours)
-->Sun Sep 28 09:32:24 TMP 2008 (date changed back upto 34 Hours, even though i mentioned above as 40 hours)
-->export TZ=TMP90:00:00 (Changing the date beyond 90 hours)
-->Sun Sep 28 09:32:42 TMP 2008 (date changed back upto 34 Hours, even though i mentioned above as 90 hours).

So looking for date change command in linux (Linux melrhtest4.nmh-au 2.6.18-8.el5 #1 SMP Fri Jan 26 14:15:14 EST 2007 x86_64).

Thanks.

Use date -s <new date & time> or date -u <UTC new date & time>
You must be logged on as root. This permanently changes the date/time.

Hi u can use this below perl

Code:

perl -e'@x=localtime time-86400;printf"%4d%02d%02d\n",$x[5]+1900,$x[4]+1,$x[3]'

change this value 86400 according millsec

Be careful when taking time backwards on UNIX servers. The timestamps are all absolute for the beginning of the epoch (number of seconds since 1970).

the system can get into a mess by doign this because it can take a look at a file and find that it has now been created in the future!

Why do you need to wind the clock back? - unless, of course, it is to bypass licensing issues?

Hi,
I am looking for date change temporarely in a session alone.
When is use TZ=TMP+140 in sunsolaris it was working and able to go back beyond five days, where as same is not working in Linux.
At max i can go beyond 34 hours in Linux.