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  2. Military designation of days and hours - Wikipedia

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

    Times relative to the designation are indicated with +/−[Arabic numeral] after the letter, replacing -day or -hour with a count of the same unit: "D−1" (the day before D-Day), "L+9" (9 hours after L-Hour) etc. [citation needed] In less formal contexts, the symbol or numeral may be spelled out: "D minus 1" or "L plus nine."

  3. 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 14, 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 (1:50 pm). International date and time formats typically follow the ISO 8601 format (2024-08-14) for all-numeric dates, [ 3] write ...

  4. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  5. 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 ...

  6. List of UTC offsets - Wikipedia

    en.wikipedia.org/wiki/List_of_UTC_offsets

    This is a 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. The main purpose of this page is to list the current standard time offsets ...

  7. Mesoamerican Long Count calendar - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_Long_Count...

    The Haabʼ date 8 Kumkʼu is the ninth day of the eighteenth month. There are 17 days to the start of the next year. Subtract 17 days from the total, to find how many complete Haabʼ years are contained. 1,383,136 − 17 = 1,383,119 by 365 1,383,119 / 365 = 3,789 and (134/365)

  8. D-Day (military term) - Wikipedia

    en.wikipedia.org/wiki/D-Day_(military_term)

    D-Day (military term) Coordinates: 49.3333°N 0.5667°W. Battle plans for the Normandy Invasion, the most famous D-Day. In the military, D-Day is the day on which a combat attack or operation is to be initiated. [1] The best-known D-Day is during World War II, on June 6, 1944—the day of the Normandy landings —initiating the Western Allied ...

  9. Day-year principle - Wikipedia

    en.wikipedia.org/wiki/Day-year_principle

    The day-year principle was partially employed by Jews [7] as seen in Daniel 9:24–27, Ezekiel 4:4-7 [8] and in the early church. [9] It was first used in Christian exposition in 380 AD by Ticonius, who interpreted the three and a half days of Revelation 11:9 as three and a half years, writing 'three days and a half; that is, three years and six months' ('dies tres et dimidium; id est annos ...