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List of military time zones

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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:[1] 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.[2]

The letter J ("Juliet"), originally skipped, is now used to indicate the observer's local time.[3]

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".

Time zone name Letter UTC offset
Alpha Time Zone A UTC+01:00
Bravo Time Zone B UTC+02:00
Charlie Time Zone C UTC+03:00
Delta Time Zone D UTC+04:00
Echo Time Zone E UTC+05:00
Foxtrot Time Zone F UTC+06:00
Golf Time Zone G UTC+07:00
Hotel Time Zone H UTC+08:00
India Time Zone I UTC+09:00
Kilo Time Zone K UTC+10:00
Lima Time Zone L UTC+11:00
Mike Time Zone M UTC+12:00
November Time Zone N UTC−01:00
Oscar Time Zone O UTC−02:00
Papa Time Zone P UTC−03:00
Quebec Time Zone Q UTC−04:00
Romeo Time Zone R UTC−05:00
Sierra Time Zone S UTC−06:00
Tango Time Zone T UTC−07:00
Uniform Time Zone U UTC−08:00
Victor Time Zone V UTC−09:00
Whiskey Time Zone W UTC−10:00
X-ray Time Zone X UTC−11:00
Yankee Time Zone Y UTC−12:00
Zulu Time Zone Z UTC±00:00

See also

References

  1. ^ Nathaniel Bowditch, American Practical Navigator, Chapter 18 "Time", Section 1806 "Zone Time".
  2. ^ "Communication instructions – General", Allied Communications Publication ACP 121(I), Annex A to Chapter 3, Combined Communications-Electronics Board, October 2010
  3. ^
  • Military/NATO/Letter time zones
  • Public Contents Framework and Military Time Zones
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