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Linux: Change Time Zone From Command Line Interface

I just learned that there are several ways to change time zone setting in Linux from command line interface (I’m using Red hat Enterprise Linux in this case),

  1. Using tzselect
    [root@localhost ~]# tzselect
    Please identify a location so that time zone rules can be set correctly.
    Please select a continent or ocean.
     1) Africa
     2) Americas
     3) Antarctica
     4) Arctic Ocean
     5) Asia
     6) Atlantic Ocean
     7) Australia
     8) Europe
     9) Indian Ocean
    10) Pacific Ocean
    11) none - I want to specify the time zone using the Posix TZ format.
    #? 5
    Please select a country.
     1) Afghanistan           18) Israel                35) Palestine
     2) Armenia               19) Japan                 36) Philippines
     3) Azerbaijan            20) Jordan                37) Qatar
     4) Bahrain               21) Kazakhstan            38) Russia
     5) Bangladesh            22) Korea (North)         39) Saudi Arabia
     6) Bhutan                23) Korea (South)         40) Singapore
     7) Brunei                24) Kuwait                41) Sri Lanka
     8) Cambodia              25) Kyrgyzstan            42) Syria
     9) China                 26) Laos                  43) Taiwan
    10) Cyprus                27) Lebanon               44) Tajikistan
    11) East Timor            28) Macau                 45) Thailand
    12) Georgia               29) Malaysia              46) Turkmenistan
    13) Hong Kong             30) Mongolia              47) United Arab Emirates
    14) India                 31) Myanmar (Burma)       48) Uzbekistan
    15) Indonesia             32) Nepal                 49) Vietnam
    16) Iran                  33) Oman                  50) Yemen
    17) Iraq                  34) Pakistan
    #? 29
    Please select one of the following time zone regions.
    1) peninsular Malaysia
    2) Sabah & Sarawak
    #? 1
    
    The following information has been given:
    
            Malaysia
            peninsular Malaysia
    
    Therefore TZ='Asia/Kuala_Lumpur' will be used.
    Local time is now:      Mon Dec 19 14:47:51 MYT 2011.
    Universal Time is now:  Mon Dec 19 06:47:51 UTC 2011.
    Is the above information OK?
    1) Yes
    2) No
    #? 1
    
    You can make this change permanent for yourself by appending the line
            TZ='Asia/Kuala_Lumpur'; export TZ
    to the file '.profile' in your home directory; then log out and log in again.
    
    Here is that TZ value again, this time on standard output so that you
    can use the /usr/bin/tzselect command in shell scripts:
    Asia/Kuala_Lumpur
  2. Direct edit timezone data file (/etc/localtime)
    [root@localhost ~]# file /etc/localtime
    /etc/localtime: timezone data
    [root@localhost ~]# file /usr/share/zoneinfo/Asia/Kuala_Lumpur
    /usr/share/zoneinfo/Asia/Kuala_Lumpur: timezone data
    [root@localhost ~]# date
    Sun Dec 18 23:33:15 EST 2011
    [root@localhost ~]# cp /usr/share/zoneinfo/Asia/Kuala_Lumpur /etc/localtime
    cp: overwrite `/etc/localtime'? y
    [root@localhost ~]# date
    Mon Dec 19 12:33:40 MYT 2011
  3. So easy, eh :)

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