Date& Time change in linux beyond few days back

komala · #1 (**permalink**) 09-29-2008

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.

jim mcnamara · #2 (**permalink**) 09-29-2008

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.

rajendra44 · #3 (**permalink**) 09-29-2008

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

Grippo · #4 (**permalink**) 09-30-2008

Quote:

Originally Posted by komala

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.

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?

komala · #5 (**permalink**) 09-30-2008

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.

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