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The military time zone system ensures clear communication in a concise manner, and avoids confusion when coordinating across time zones. The CCEB , representing the armed forces of Australia, Canada, New Zealand, the United Kingdom, and the United States, publishes the military time zone system as the ACP 121 standard. [ 1 ]
Learn about the 24-hour clock, the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. See how it is indicated by the hours and minutes passed since midnight, from 00 (:00) to 23 (:59), with 24 (:00) as an option to indicate the end of the day.
Learn how dates and times are written and spoken in the U.S., and how they differ from international standards. Find out about the various formats used by the military, government, and other domains.
Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It is based on atomic clocks and is not adjusted for daylight saving time. Learn about its history, uses, mechanism, and leap seconds.
A comprehensive list of the UTC time offsets, showing the difference in hours and minutes from Coordinated Universal Time (UTC), from the westernmost (−12:00) to the easternmost (+14:00). It includes countries and regions that observe them during standard time or year-round, as well as information on daylight saving time or historical changes in offsets.
a.m. stands for ante meridiem, meaning "before midday" in Latin, and p.m. stands for post meridiem, meaning "after midday" in Latin. The 12-hour clock is a time convention that divides the day into two periods of 12 hours each, with a.m. and p.m. indicating the morning and afternoon.
The evolution of United States standard time zone boundaries from 1919 to 2024 in five-year increments. Plaque in Chicago marking the creation of the four time zones of the continental US in 1883 Colorized 1913 time zone map of the United States, showing boundaries very different from today Map of U.S. time zones during between April 2, 2006, and March 11, 2007.
Learn about the definition, history, and usage of defense standards, specifications, and handbooks in the U.S. Department of Defense. Find out how these documents help achieve standardization, interoperability, and performance of military equipment and systems.