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  2. History of time in the United States - Wikipedia

    en.wikipedia.org/wiki/History_of_time_in_the...

    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.

  3. List of observances in the United States by presidential ...

    en.wikipedia.org/wiki/List_of_observances_in_the...

    U.S. law provides for the declaration of selected public observances by the President of the United States as designated by Congress or by the discretion of the President. [1] Generally the President will provide a statement about the purpose and significance of the observance, and call on the people of the United States to observe the day ...

  4. 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.

  5. Military designation of days and hours - Wikipedia

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

    The specific time at which deployment for an operation commences. (US) L-Day For "Landing Day", 1 April 1945, the day Operation Iceberg (the invasion of Okinawa) began. [5] M-Day The day on which mobilization commences or is due to commence. (NATO) N-Day The unnamed day an active duty unit is notified for deployment or redeployment. (US) O-Day

  6. National Military Appreciation Month - Wikipedia

    en.wikipedia.org/wiki/National_Military...

    Military Appreciation Month: Observed by: United States: Type: National, Historic: Significance: Dedicates a month for the recognition and appreciation of active and retired members of the United States Armed Forces: Observances: Military Spouse Day, Memorial Day, Loyalty Day and Armed Forces Day [1] Begins: May 1 [2] Ends: May 31: Frequency ...

  7. United States federal observances - Wikipedia

    en.wikipedia.org/wiki/United_States_federal...

    These observances differ from federal holidays in that federal employees only receive a day free from work on holidays, not observances. Federal observances that are designated by Congress appear in Title 36 of the United States Code (36 U.S.C. § 101 et seq.). Below is a list of all observances so designated.

  8. List of military time zones - Wikipedia

    en.wikipedia.org/?title=List_of_military_time...

    From a page move: This is a redirect from a page that has been moved (renamed).This page was kept as a redirect to avoid breaking links, both internal and external, that may have been made to the old page name.

  9. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    Standard time in the contiguous United States, illustration 1903. From east to west, the four time zones of the contiguous United States are: Eastern Time Zone (Zone R), which comprises roughly the states on the Atlantic coast and the eastern two thirds of the Ohio Valley.