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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.
In American English, the term military time is a synonym for the 24-hour clock. In the US, the time of day is customarily given almost exclusively using the 12-hour clock notation, which counts the hours of the day as 12, 1, ..., 11 with suffixes a.m. and p.m. distinguishing the two diurnal repetitions of this sequence.
DDHHMMSSZmmmYY - Full time (used for software timestamps) DDHHMMZmmmYY - shortened time (used e.g. for timestamps manually written) DDHHMMZ - short time (e.g. used for planning) Z references the military identifier of time zone: UTC-12: Y (e.g., Baker Island) UTC-11: X (American Samoa, Niue) UTC-10: W (Honolulu, HI) UTC-9: V (Juneau, AK)
In traditional American usage, dates are written in the month–day–year order (e.g. June 4, 2024) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (8:40 am). International date and time formats typically follow the ISO 8601 format (2024-06-04) for all-numeric dates, [3] write the ...
ISO 8601. International standard ISO 8601 ( Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds. These standard notations have been adopted by many countries as a national standard, e ...
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 .
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".
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]
Standard time is the synchronization of clocks within a geographical region to a single time standard, rather than a local mean time standard. Generally, standard time agrees with the local mean time at some meridian that passes through the region, often near the centre of the region.