I have a virtual machine that is set to PST that a couple of colleagues have in different timezones. If I wanted to change the time-zone to EST and GMT, what do I need to do?

up vote 210 down vote accepted

Use timedatectl

sudo timedatectl set-timezone <timeszone>

Examples:

  • Timezone as EST

    sudo timedatectl set-timezone EST
    
  • Timezone as UTC

    sudo timedatectl set-timezone UTC
    
  • Listing all valid Timezones

    timedatectl list-timezones
    

This command is perfect for automation scripts since it doesn't require any user interaction while compared to the other given answer based on dpkg-reconfigure tzdata.

  • 1
    Not a fan of +1 comments, but am putting one here since this worked for me in the best way. I was wanting a single one-line command line tool to change the timezone, rather than wanting to launch some whole either menu or gui program (I don't know what tzdata does, how it works, but I don't need to with this one line command). Thanks! – Phil Ryan Jun 1 '15 at 23:21
  • works like a charm ;) – user332660 Feb 24 '16 at 10:01
  • Interestingly, it is doing something a little different than tzdata. I had an issue with Java time being different than the system time after applying a patch. Tzdata didn't work to fix the issue, but this did. – Daniel Bower Mar 23 '16 at 15:54
  • 1
    this didn't work for me; however the dpkg-reconfigure did the trick. – Antti Haapala Apr 10 '16 at 11:39
  • 14.04.4 ubuntu server – Antti Haapala Apr 10 '16 at 11:44

As root you have to execute:

dpkg-reconfigure tzdata

A menu based tool should be started that allows you to change the timezone.

The following also work. For GMT:

ln -sf /usr/share/zoneinfo/GMT /etc/localtime

For EST:

ln -sf /usr/share/zoneinfo/EST /etc/localtime
  • 7
    I think it would be better to link one of the city files rather than GMT or EST, as then they will keep track of daylight savings time, whereas linking (e.g.) GMT will not change the system time to reflect when daylight savings is in effect in your city. e.g.: ln -sf /usr/share/zoneinfo/Europe/London /etc/localtime – Asfand Qazi Jun 8 '15 at 9:19

The most ease way especially to a server is to list timezones:

timedatectl list-timezones

And choose yours, for example:

timedatectl set-timezone Europe/Athens

Thats it! , :-)

To run one program with a different time zone setting, set the TZ environment variable, e.g. run TZ=Pacific/Kiritimati date to see what time it is on Christmas Island, or export TZ=Pacific/Kiritimati to have the setting last for a shell session.

Edit the timezone file at the /etc folder as:

Etc/GMT

You can use the next format:

Region "/" City 

Example of /etc/timezone:

Europe/Athens

or

Europe/Paris
Europe/London

You may experiment with the: dpkg-reconfigure tzdata and check cat the timezone file.

You must reboot or start again a service (not the ntp service). I do not know which one. If somebody knows please share with us. (Tested on Ubuntu 15.10 the change is taken into account instantly)

cp -p /usr/share/zoneinfo/US/Pacific /etc/localtime

I recommend AGAINST linking like mentioned by others. If some script accidentally over writes your /etc/localtime file, then it overwrites your Pacific timezone file... and it's a bit of a pain to replace it.

Just copy the Pacific file over the localtime file with the command above.

  • This actually worked for me. I think there's some bug with Docker, ansible (?). Both timedatectl and dpkg-reconfigure tzdata failed for me. After I copied, the time zone changed from EST to PDT. – Sun Jun 12 at 15:25

I use the following script to ask the user which timezone to set, and then confirm it has indeed been set:

#!/bin/sh
sudo timedatectl set-timezone $(tzselect)
echo
echo timedatectl says:
timedatectl

I call it tz-set.

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