Q. My timezone is pointing to wrong timezone. How do I setup or change the timezone under Linux operating systems?
A. Unix time, or POSIX time, is a system for describing points in time: it is the number of seconds elapsed since midnight UTC on the morning of January 1, 1970, not counting leap seconds.
The definition for time zones can be written in short form as UTC±n (or GMT±n), where n is the offset in hours.
Change Linux timezone
Select the method as per your Linux distribution:
If you are using Fedora / RHEL / Cent OS Linux
Type the redhat-config-date command at the command line to start the time and date properties tool.
# redhat-config-date
OR type setup and select time zone configuration (good for remote ssh text based Linux server sessiob)
# setup
Select timezone configuration
Fig.01: Redhat / CentOS Server Setting Up Timezone
Now, just follow on screen instructions to change timezone.
Set timezone using /etc/localtime configuration file [any Linux distro]
Often /etc/localtime is a symlink to the file localtime or to the correct time zone file in the system time zone directory.
Generic procedure to change timezone
Change directory to /etc
# cd /etc
Create a symlink to file localtime:
# ln -sf /usr/share/zoneinfo/EST localtime
OR some distro use /usr/share/zoneinfo/dirname/zonefile format (Red hat and friends)
# ln -sf /usr/share/zoneinfo/EST localtime
OR if you want to set up it to IST (Asia/Calcutta):
# ln -sf /usr/share/zoneinfo/Asia/Calcutta localtime
Please mote that in above example you need to use directory structure i.e. if you want to set the timezone to Calcutta (India) which is located in the Asia directory you will then have to setup using as above.
Use date command to verify that your timezone is changed:
$ date
Output:
Tue Aug 27 14:46:08 EST 2006
Use of environment variable
You can use TZ environment variable to display date and time according to your timezone:
$ export TZ=America/Los_Angeles
$ date
Sample Output:
Thu Aug 27 11:10:08 PST 2006
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{ 43 comments… read them below or add one }
Great Info
On Ubuntu you can do
tzconfig
to select and set the time zone.
(tzconfig copies the right time zone file from /usr/share/zoneinfo to /etc/localtime and puts the name of the timezone into /etc/timezone)
Counterintuitively, you should not symlink, only ever copy timezone data files. This is because some programs might attempt to alter /etc/localtime. Before you make a change, notice that /etc/localtime is a regular file.
Note – you’re missing an ‘e’ on the end of:
Create a symlink to file localtime:
# ln -sf /usr/share/zoneinfo/EST localtim
a
Andy,
Thanks for pointing out a typo. The faq has been updated.
I don’t get to change the TZ. I cann’t install the tzconfig. I have Ubuntu 8.04. What is wrong ?
Hey.. thanks.. it saved my life..
[root@ps2844 ~]# date
Tue Dec 2 10:19:11 UTC 2008
Using the “setup” command, I selected timezone as Asia/Calcutta, and did not check the UTC box. But the time zone does not change.
[root@ps2844 ~]# setup
[root@ps2844 ~]# date
Tue Dec 2 10:20:26 UTC 2008
Also, I did the sym-link for localtime, but without help.
[root@ps2844 ~]# ls -l /etc/localtime
lrwxrwxrwx 1 root root 33 Dec 2 10:16 /etc/localtime -> /usr/share/zoneinfo/Asia/Calcutta
On CentOS5, the command is system-config-date. Likely on CentOS4 and earlier as well. Probably related to removing all branding from the upstream vendor’s sources.
Thanks! (system-config-date) That worked.
use tzselect for ubuntu gutsy
1.Iam having a linux virtual machine running apache server in RHEL4.4. Iam facing a problem that everyday in the morning I had to change its date and time . It is always running 12hrs back.
Use an NTP cronjob to update your time
1. iam also facing problem in RHJEL 5.2 virtualization. Iam having one host machine installed with RHEL 5.2. Iam also running 03 Server Virtually on it. But via network i can access virtual machine but not the host machine. Many tinme I had to restart the network service but after some time the problem exist. The service is also put under chkconfig.
2. Iam having a linux virtual machine running apache server in RHEL4.4. Iam facing a problem that everyday in the morning I had to change its date and time . It is always running 12hrs back.
Thanks a lot. This really helped me.
On CactiEZ 0.6 (based on CentOS) the command is ‘tzselect’ too.
No more system-config-date or ‘config’
cheers
Slackware dudes, use tzselect;
Or simply create a symbolic link called
/etc/localtime
from the suitable zones resides in /usr/share/zone
God bless god,
Thanks buddy, it helped me a lot!!
Does anybody know what can be done on SUSE if this does not work for some TZ? UTC works for example, but setting to Europe/Berlin or GB does not. These give back an empty value when using
date +%Z
RHEL 5 is also using tzselect as the command name.
OH MY GAD! Thank you for this article. I searched a long time to find this solution that finally worked. I use proxmox and this was the only thing that did it.
Thanks budy ,
I have same issue which has been resolved with help of you guys
Hai…
My Hp-ux server showing wrong time …so how can i change it…
hp-ux server:HP-UX B.11.11 U 9000/800 941485843 unlimited-user license
and if i change hp-ux server is it change in oracle database also..
Hello,
How to change the TimeZone of the server based in London but it has same TZ as Paris.
We have Linux server.
Using command line and which files to be modified.
Can any one help me out for the above.
FYI, on Ubuntu 10.04, I also thought it was necessary to manually maintain /etc/localtime, /etc/timezone and friends to change to Asia/Calcutta. But I noticed when running “dpkg-reconfigure tzdata” that Asia/Kolkata does show up, and this is the same city/timezone. redhat-config-date might do something similar, I don’t know.
/usr/share/zoneinfo/Asia/Calcutta and /usr/share/zoneinfo/Asia/Kolkata point to the same inode on my system.
It works. Thanks a lot.
Thanks a bunch. I found this extremely useful to set my Server time to Indian TimeZone.
It worked thanks a lot
using fedora… “rm /etc/localtime” first and then make the link , worked for me.
Now amsn works fine and my local time now its right.
thx a lot.
I mistakenly typed in date -u now it always shows date in UTC time, everytime I type date. I want the date to revert back to showing PST time when I type date.
How do I revert back for date to just PST time agan.
Don’t use “system-config-date” if you have build the symbolic link like
[root zoneinfo]# ls -l /etc/localtime
lrwxrwxrwx 1 root root 23 Jan 20 13:43 /etc/localtime -> /usr/share/zoneinfo/GMT
It could corrupt your original file “/usr/share/zoneinfo/GMT”
I was puzzling weeks on it to find out that my original files were corrupted.
I got that hint from another thread out there.
For Debian/Ubuntu, you have to edit
:
, or
and locate your city in (relative) directory/file tree, i.e. Europe/Athens; put this exact string in
.
In Arch, simply edit /etc/rc.conf and modify TIMEZONE.
it sould be the relative path to the zoneinfo file in /usr/share/zoneinfo
for example to set your local time to New York:
> cd /usr/share/zoneinfo/
> find . -name New_York
./America/New_York
now edit rc.conf:
TIMEZONE=”America/New_York”
I want it to work for ‘UBUNTU’.
Please help.
So after I use the /etc/localtime method sure if I type date the response from date is in the right timezone, but what about every running task, they are still using the old timezone. examples are crontab, mysqld, etc… obviously booting the system does ensure everything changes over, and cycling crontab for example fixes it, but is their a easy way to sync all without an outage.
Dear Vijay,
My Linux mechines are running under vmware server. My server time is changed every day. I reset my time every date with date -s command. But my windows mechines are running good. Time variation between linux and windows varied. Every day morning my clock shows 09:00 o clock but my server shows 09:50 or 10:00 or 10:03…. How do i set my linux box time constantly
can you help change time zone for linux suse
suse: use yast
It works for ubuntu/kubuntu also. Thanks a lot.
Thanks! The ln method worked fine on FC14.
I noticed that some things (httpd) do not pick up the change until restarted.
Hi,
I running shell script in Ec2-amazon web service.I dont want to change the time zone of server rather wanted to know with some command if I can get IST time.By default it shows UTC .I think if we pass some parameter with date command ,it should work. Please help me out .
really a valuable information……………Thanks for that piece.
Setting timezone via /etc/localtime worked fine in CentOS 6!