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The military time zones are a standardized, uniform set of time zones for expressing time across different regions of the world, named after the NATO phonetic alphabet. The Zulu time zone (Z) is equivalent to Coordinated Universal Time (UTC) and is often referred to as the military time zone.
Military usage, as agreed between the United States and allied English-speaking military forces, differs in some respects from other twenty-four-hour time systems: No hours/minutes separator is used when writing the time, and a letter designating the time zone is appended (for example "0340Z").
The 24-hour clock is used in military, public safety, and scientific contexts in the United States. It is best known for its use by the military and is therefore commonly called "military time". In U.S. military use, 24-hour time is traditionally written without a colon (1800 instead of 18:00).
Military designation of days and hours. NATO designations are specified in Allied Administrative Publication AAP-6 ( STANAG 3680) NATO Glossary of Terms and Definitions, and marked (NATO) in this list. Entries specific to the U.S. and defined only in Joint Publication JP 1-02 [1] are marked (US).
This timeline of United States government military operations, based in part on reports by the Congressional Research Service, shows the years and places in which U.S. military units participated in armed conflicts or occupation of foreign territories.
Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It establishes a reference for the current time, forming the basis for civil time and time zones .
Military Date Time Group. A form of DTG is used in the US Military 's message traffic (a form of Automated Message Handling System ). In US military messages and communications (e.g., on maps showing troop movements) the format is DD HHMM (SS) Z MON YY.
Hours on a 24-hour clock ("military time") are expressed as "hundred" or "hundred hours". [7] (1000 is read "ten hundred" or "ten hundred hours"; 10 pm would be "twenty-two hundred".) Fifteen and thirty minutes past the hour is expressed as "a quarter past" or "after" [8] and "half past", respectively, from their fraction of the hour.
ISO 8601 is an international standard covering the worldwide exchange and communication of date and time -related data. It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]
The Department of Defense master clock is the atomic master clock to which time and frequency measurements for the United States Department of Defense are referenced. Located in Washington D.C., the U.S. Naval Observatory master clock is designated as the "DOD Master Clock".