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  2. Military designation of days and hours - Wikipedia

    en.wikipedia.org/wiki/Military_designation_of...

    H-Hour. The specific time at which an operation or exercise commences, or is due to commence (this term is used also as a reference for the designation of days/hours before or after the event). (NATO); also known as 'Zero Hour'. I-Day. Used informally within the U.S. military bureaucracy to variously designate the "Implementation Day" or the ...

  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. 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. November 12, 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 (9:37 am). International date and time formats typically follow the ISO 8601 format (2024-11-12) for all-numeric dates, [3] write ...

  5. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour digital clock in Miaoli HSR station.. A time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of full minutes that have passed since the last full hour, and ss (00 to 59) is the number of seconds since the last ...

  6. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    The time of day is typically expressed in English in terms of hours. Whole hours on a 12-hour clock are expressed using the contracted phrase o'clock, from the older of the clock. [6] (10 am and 10 pm are both read as "ten o'clock".) Hours on a 24-hour clock ("military time") are expressed as "hundred" or "hundred hours".

  7. List of United States Marine Corps acronyms and expressions

    en.wikipedia.org/wiki/List_of_United_States...

    Military Time – The time of day on a 24-hour clock. General Wallace M. Greene forbade the practice of suffixing the unnecessary word "hours" after each indication of time of day ("1330" or "thirteen-thirty" instead of "1330 hours"); the practice of saying "oh" instead of "zero" for hours before 1000 has diminished as well. MOPP equipment

  8. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    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 standard provides a well-defined ...

  9. Date-time group - Wikipedia

    en.wikipedia.org/wiki/Date-time_group

    Date-time group. In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC). [citation needed]