how to add 5 years to current date

kuravalasekhar · 03-17-2010, 09:14 AM

Dear All,

I am using Red hat Linux operating system.I want change the date exactly 5 years ago to current date with out providing month, date and time. I want only the year should be 5 years ago .please help in this regard
example

If current date is this = Wed mar 18 22:59:23 IST 2010

past date shuld be like this= Sat Mar 18 22:59:23 IST 2005

centosboy · 03-17-2010, 09:27 AM

Quote:

Originally Posted by kuravalasekhar

Dear All,

I am using Red hat Linux operating system.I want change the date exactly 5 years ago to current date with out providing month, date and time. I want only the year should be 5 years ago .please help in this regard
example

If current date is this = Wed mar 18 22:59:23 IST 2010

past date shuld be like this= Sat Mar 18 22:59:23 IST 2005

use date --date=years ago

sorry if you only want certain parts use the

Code:

[root@xxx ~]# date --date='5 years ago'
Thu Mar 17 14:27:33 GMT 2005

errm...if you want only the year returned use

Code:

date --date "5 years ago" +%y

kuravalasekhar · 03-18-2010, 01:17 AM

Quote:

Originally Posted by centosboy

use date --date=years ago

sorry if you only want certain parts use the

Code:

[root@xxx ~]# date --date='5 years ago'
Thu Mar 17 14:27:33 GMT 2005

errm...if you want only the year returned use

Code:

date --date "5 years ago" +%y

Dear friend ,

i am not asking to just display .that date should be updated by 5 years ago and this should not updated by network.

centosboy · 03-18-2010, 03:23 AM

Quote:

Originally Posted by kuravalasekhar

Dear friend ,

i am not asking to just display .that date should be updated by 5 years ago and this should not updated by network.

sorry - i dont understand....

chrism01 · 03-18-2010, 04:26 AM

He wants to wind the clock back 5 years.
To avoid network update, see the ntp server:

service ntpd stop

Use chkconfig to turn it off permanently. You can also do it through the GUI if you've got it.

IMHO, the system will break if you do that; much software assumes time is ongoing ...

Why do you want to do this?

centosboy · 03-18-2010, 10:28 AM

Quote:

Originally Posted by kuravalasekhar

Dear friend ,

i am not asking to just display .that date should be updated by 5 years ago and this should not updated by network.

Code:

date 031815252005

...

Code:

date MMDDhhmmCCYY

evo2 · 03-18-2010, 10:36 AM

Hint: you can do this by running the date command twice in the same commandline. Ie one invocation to print the date which is used as input to set the date. However I can imagine that doing this could cause all sorts of problems to running processes.

What may be a safer way is to reboot and reset the date in the bios, then when your system boots up it will read that date... I would still anticipate problems though, sicne you will have many files on your file systems that your os will think are dated up to 5 years in the future. You could play another trick by booting off a live cd, then mounting your drives and then use find and touch to change all the timestamps.

Hmm, this is all very dirty stuff.

Evo2.