Change your timezone

• Non-interactively set timezone in Ubuntu

  Replace the first part of the command above with the appropriate timezone string. Eg: 'Europe/London' or for UTC - 'Etc/UTC'. The appropriate string can be found from https://en.wikipedia.org/wiki/List_of_tz_database_time_zones This is useful when your server is installed by a data centre (managed hardware, VPS, etc) and the timezone is not usually set to the one your prefer.

  This is sample output - yours may be different.

  
  

  0
  echo 'Etc/UTC' | tee /etc/timezone; dpkg-reconfigure --frontend noninteractive tzdata
  donatello · 2013-04-22 06:14:55 0
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• Convert unix timestamp to date

  The "-d" option for gnu's "date" command can calculate positive or negative offset from any time, including "now". You can even specify a source timezone (the output timezone can be set with the TZ environment variable). Useful! Fun! Not very well documented! Show Sample Output

  This is sample output - yours may be different.

  $ date -ud "1970-01-01 + 1234567890 seconds"
  Fri Feb 13 23:31:30 UTC 2009
  
  # and back again
  $ date -ud "Fri Feb 13 23:31:30 2009" +%s
  1234567890
  

  
  

  6
  date -ud "1970-01-01 + 1234567890 seconds"
  zude · 2009-10-07 04:35:40 3
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• Get me yesterday's date, even if today is 1-Mar-2008 and yesterday was 29-Feb-2008

  Fool date by setting the timezone out by 24 hours and you get yesterday's date. Try TZ=XYZ-24 to get tomorrow's date. I live in TZ=GMT0BST so you might need to shift the number 24 by the hours in your timezone.

  This is sample output - yours may be different.

  
  

  1
  TZ=XYZ24 date
  jonty · 2009-02-05 13:27:14 2
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• Want to known what time is it in another part of the world ?

  available timezone can be found in /usr/share/zoneinfo. Other examples: TZ=Europe/Paris date; TZ=Australia/Sydney date; TZ=America/New_York date this is based on zoneinfo files on macosx. Your mileage my vary on other unix dialects

  This is sample output - yours may be different.

  
  

  5
  TZ=Indian/Maldives date
  berta · 2009-02-18 20:12:55 0
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• Timezone conversions (eg: what time was @tz_dest when it was $tm @tz_orig)

  This is sample output - yours may be different.

  
  

  0
  TZ="$tz_dest" date -d "$(TZ="$tz_orig" date -d "$tm")"
  warlockcc · 2010-10-01 17:55:04 0
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• get time in other timezones

  prints out the time for the timezone specified in $offsetutc. So you have less to think about things like: "I'm in utc+4 and my friend in utc-7, can I call him now or will I wake him?" Note: $offsetutc should be an integer between -12 and 12. Show Sample Output

  This is sample output - yours may be different.

  utc:   Fri Aug  7 23:07:24 UTC 2009
  utc+2: Sat Aug  8 01:07:24 UTC 2009
  
  

  
  

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  let utime=$offsetutc*3600+$(date --utc +%s)+3600; date --utc --date=@${utime}
  flokra · 2009-08-07 23:12:14 0
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