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  2. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    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. UTC facilitates international communication, navigation, scientific research, and commerce. UTC has been widely embraced by most countries and ...

  3. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    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. The military time zone system ensures clear ...

  4. Universal Time - Wikipedia

    en.wikipedia.org/wiki/Universal_Time

    Universal Time (UT or UT1) is a time standard based on Earth's rotation. [1] While originally it was mean solar time at 0° longitude, precise measurements of the Sun are difficult. Therefore, UT1 is computed from a measure of the Earth's angle with respect to the International Celestial Reference Frame (ICRF), called the Earth Rotation Angle ...

  5. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    In traditional American usage, dates are written in the month–day–year order (e.g. August 11, 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 (4:06 am). International date and time formats typically follow the ISO 8601 format (2024-08-11) for all-numeric dates, [ 3] write ...

  6. UTC+09:00 - Wikipedia

    en.wikipedia.org/wiki/UTC+09:00

    This map shows the difference between legal time and local mean time in Japan and its neighborhood. Eastern part of Hokkaido is over 30 minutes behind and western part of Ryukyu islands is over 30 minutes ahead of local solar time as a single standard time offset of UTC+09:00 is observed in whole country of Japan, even in its easternmost territory, Minamitorishima (153°59′E) and its ...

  7. Atomic clock - Wikipedia

    en.wikipedia.org/wiki/Atomic_clock

    The master atomic clock ensemble at the U.S. Naval Observatory in Washington, D.C., which provides the time standard for the U.S. Department of Defense. [1] The rack mounted units in the background are Microsemi (formerly HP) 5071A caesium beam clocks. The black units in the foreground are Microsemi (formerly Sigma-Tau) MHM-2010 hydrogen maser ...

  8. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Each time zone is defined by a standard offset from Coordinated Universal Time(UTC). The offsets range from UTC−12:00to UTC+14:00, and are usually a whole number of hours, but a few zones are offset by an additional 30 or 45 minutes, such as in Indiaand Nepal.

  9. Standard time - Wikipedia

    en.wikipedia.org/wiki/Standard_time

    Standard time. 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. Historically, standard time was established ...