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List of military time zones
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List of military time zones : ウィキペディア英語版
List of military time zones
This is a list of time zones as used by the U.S. military, Chinese military and others. The names are based on the NATO phonetic alphabet (with two spelling changes: Alpha for "Alfa", Juliet for "Juliett").
Going east from the prime meridian at Greenwich, letters Alpha through Mike (skipping "J", see below) are used for the 12 time zones with mainly positive UTC offsets until reaching the International Date Line. Going west from Greenwich, letters November through Yankee are used for zones with negative time offsets.
The system originates with Nathaniel Bowditch's 1802 ''American Practical Navigator'' where time zones were labelled with letters:〔Nathaniel Bowditch, ''American Practical Navigator'', Chapter 18 "Time", Section 1806 "Zone Time".〕 the letter "J" was skipped to avoid confusion with "I" (as was the custom of the time) and because some alphabets don't have one (such as Cyrillic). The militaries of Australia, Canada, New Zealand, the United Kingdom, and the United States (also known as Five Eyes) use Allied Communications Publication (ACP) 121 as their reference for the time zone designators.〔"(Communication instructions – General )", Allied Communications Publication ACP 121(I), Annex A to Chapter 3, Combined Communications-Electronics Board, October 2010
The letter J ("Juliet"), originally skipped, is now used to indicate the observer's local time.
The letter Z ("Zulu") indicates Greenwich Mean Time (GMT) or Coordinated Universal Time (see UTC±00:00).
They are used in conjunction with military time: for instance, 6:00 a.m. in zone UTC−5 is written "0600R" and spoken "zero six hundred Romeo".
==See also==

*List of time zones

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