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{{header|infra}} | |||
= UTC Howto = | = UTC Howto = | ||
== What is UTC? == | == What is UTC? == | ||
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There are several ways: | There are several ways: | ||
# Do mental arithmetic. You need to know the offset of you timezone and add it to UTC. A table with some timezone offsets is below. | |||
# You can use the commandline tool ''date'' for this. This only works when you use a machine that is configured to display your timezone. <pre>$ date -d '2007-06-07 04:00 UTC' | |||
$ date -d '2007-06-07 04:00 UTC' | Thu Jun 7 00:00:00 EDT 2007 | ||
</pre> | </pre> | ||
# You can use an [http://www.timeanddate.com/worldclock/converter.html online time calculator] | |||
== How can I convert my/any localtime into UTC? == | == How can I convert my/any localtime into UTC? == | ||
# Do mental arithmetic. You only need to substract the offset of your timezone from your localtime to get UTC. A table with some timezone offsets is below. | |||
# You can use the commandline tool ''date'' for this. <pre>$ date -u -d "2007-06-07 00:00 EDT" +"%Y-%m-%d %H:%M %Z" # this converts a given time to UTC | |||
$ date -u -d "2007-06-07 00:00 EDT" +"%Y-%m-%d %H:%M %Z" # this converts a given time to UTC | |||
2007-06-07 04:06 UTC | 2007-06-07 04:06 UTC | ||
$ date -u +"%Y-%m-%d %H:%m %Z" # this display the current time in UTC | $ date -u +"%Y-%m-%d %H:%m %Z" # this display the current time in UTC | ||
2007-06-29 20:06 UTC | 2007-06-29 20:06 UTC</pre> | ||
</pre> | # You can use the graphical tool ''international-time'': <pre>$ international-time</pre> | ||
# You can use an [http://www.timeanddate.com/worldclock/converter.html online time calculator] | |||
$ international-time | |||
</pre> | |||
== Table of timezones == | == Table of timezones == | ||
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[[Category:Infrastructure]] | [[Category:Infrastructure]] | ||
Revision as of 21:34, 25 May 2008
UTC Howto
What is UTC?
Coordinated Universal Time (UTC) is the official world time. Your local time is this world time plus or minus an offset. For most timezones this offset is an multiple of an hour. Typical dates in UTC look like these:
2007-06-07 04:00 UTC 2007-06-07 04:00 +0000 2007-06-07T04:00UTC
You can find a long article about UTC at Wikipedia .
How can I convert UTC into localtime?
There are several ways:
- Do mental arithmetic. You need to know the offset of you timezone and add it to UTC. A table with some timezone offsets is below.
- You can use the commandline tool date for this. This only works when you use a machine that is configured to display your timezone.
$ date -d '2007-06-07 04:00 UTC'
Thu Jun 7 00:00:00 EDT 2007
- You can use an online time calculator
How can I convert my/any localtime into UTC?
- Do mental arithmetic. You only need to substract the offset of your timezone from your localtime to get UTC. A table with some timezone offsets is below.
- You can use the commandline tool date for this.
$ date -u -d "2007-06-07 00:00 EDT" +"%Y-%m-%d %H:%M %Z" # this converts a given time to UTC
2007-06-07 04:06 UTC $ date -u +"%Y-%m-%d %H:%m %Z" # this display the current time in UTC 2007-06-29 20:06 UTC
- You can use the graphical tool international-time:
$ international-time
- You can use an online time calculator
Table of timezones
| EDT | US/Eastern Daylight Time | New York | -0400 | 2007-06-07 00:00 EDT |
| CET | Central European Time | Berlin | +0100 | 2007-06-07 05:00 CET |
| CEST | Central European Summer Time | Berlin | +0200 | 2007-06-07 05:00 CEST |