How to change Time zone in Linux

Madeswaran N

Method 1: Creating link file to corresponding Timezone

 # cd /etc
# rm localtime  //delete the existing localtime file

 Check the available time zones in US

 # ls /usr/share/zoneinfo/US/    
Alaska          Arizona         Eastern         Hawaii          Michigan        Pacific
Aleutian        Central         East-Indiana    Indiana-Starke  Mountain        Samoa

 Note: For other country timezones, browse the /usr/share/zoneinfo directory

 Now we can change the time zone using below step

 # ln -sf /usr/share/zoneinfo/Asia/Calcutta localtime

 Now check the time

 #date 

 # date
Mon Aug 17 23:10:14 IST 2013

 But if you are doing any patching then after patching this Time zone will get changed. So this method is not perfect one.
                                            
Method 2: Change TimeZone Using /etc/timezone File
# vi /etc/timezone
America/Los_Angeles 

 then export the TZ variable

 $ export TZ=America/Los_Angeles
$ date
Method 3: Command line tools.

 Using below interactive method also we can change the Time zone

 Ubuntu: dpkg-reconfigure tzdata
Redhat: redhat-config-date
CentOS/Fedora: system-config-date
FreeBSD/Slackware: tzselect



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