Time Zone Conversion

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Military / NATO / letter timezones

This is a list of time zones as used by the U.S. 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 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".

The use of Military TimeZones for the Internet is described in RFC 822.

The following table lists the Military time zone abbreviations.

The basis for this is Z - Zulu time - Zero meridian time - the same as UTC It's a convention to assign letters to time zones, where Z= Zero meridian, and Zulu is the word that represents the letter Z, when it's used in communication. It is sometimes used in the US Military and NATO in conjunction with 24 hour clocks, and is also popular to use in movies to reference time.

Other letters/words are used for other time zones than UTC, most based on the right or reverse order of the Alphabet. Note that 'J' is skipped ('J' - Juliet refers to current local time of the observer). There are 25 time zones defined here, but 26 letters in the English alphabet.

Abbreviation Full name Other abbreviations Time zone
Z Zulu Time Zone UTC
Y Yankee Time Zone UTC - 12 hours
X X-ray Time Zone UTC - 11 hours
W Whiskey Time Zone UTC - 10 hours
V Victor Time Zone UTC - 9 hours
U Uniform Time Zone UTC - 8 hours
T Tango Time Zone UTC - 7 hours
S Sierra Time Zone UTC - 6 hours
R Romeo Time Zone UTC - 5 hours
Q Quebec Time Zone UTC - 4 hours
P Papa Time Zone UTC - 3 hours
O Oscar Time Zone UTC - 2 hours
N November Time Zone UTC - 1 hour
A Alpha Time Zone UTC + 1 hour
B Bravo Time Zone UTC + 2 hours
C Charlie Time Zone UTC + 3 hours
D Delta Time Zone UTC + 4 hours
E Echo Time Zone UTC + 5 hours
F Foxtrot Time Zone UTC + 6 hours
G Golf Time Zone UTC + 7 hours
H Hotel Time Zone UTC + 8 hours
I India Time Zone UTC + 9 hours
K Kilo Time Zone UTC + 10 hours
L Lima Time Zone UTC + 11 hours
M Mike Time Zone UTC + 12 hours
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