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Coordinated Universal Time
Coordinated Universal Time (UTC) is the standard time zone of the world. The standard before was Greenwich Mean Time (GMT). UTC and GMT are almost the same. It is also called civil time and Zulu time.
Some websites, like Wikipedia, use UTC because it does not make any country look more important than the others. It offers one time for all the internet (the same time can be used by people all over the world).
Timezones are often named by how many hours they are different from UTC time. For example, UTC -5 (United States east coast) is 5 hours behind UTC. If the time is 07:00 UTC, the local time is 02:00 in New York (UTC -5) and 11:00 in Moscow (UTC +4).
07:00 UTC is also written more simply as 0700Z (or 07:00Z).
Note that UTC uses the 24-hour clock. That means there is no 'AM' or 'PM'. For example, 4:00PM would be 16:00 or 1600.
When this page loaded, it was Saturday, 2018 May 26, 11:58 in UTC
When this page loaded, it was Saturday, 2018 May 26, 11:58Z