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

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

    The United States uses the 12-hour clock almost exclusively, not only in spoken language, but also in writing, even on timetables, for airline tickets, and computer software. The suffixes "a.m." and "p.m." (often represented as AM and PM) are appended universally in written language.

  3. 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).

  4. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    Some Indiana counties near Cincinnati and Louisville were on Eastern Time but did (unofficially) observe DST. The Energy Policy Act of 2005 extended daylight saving time for an additional month beginning in 2007. The Sunshine Protection Act of 2021 passed the United States Senate in March 2022. The bill would make daylight saving time the time ...

  5. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    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] (1000 is read "ten hundred" or "ten hundred hours"; 10 pm would be "twenty-two hundred".)

  6. Military time zone - Wikipedia

    en.wikipedia.org/wiki/Military_time_zone

    The note states "This method is based on the systems in use in the Armed Forces of these countries and the United States". [9] The British used a system of lettered zones, which was likely the direct influence. [10] [better source needed] RFC 733 published in 1977 allowed using military time zones in the Date: field of emails. [11]

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  8. Universal Time - Wikipedia

    en.wikipedia.org/wiki/Universal_Time

    Standard time zones of the world. The number at the bottom of each zone specifies the number of hours to add to UTC to convert it to the local time. As international commerce increased, the need for an international standard of time measurement emerged. Several authors proposed a "universal" or "cosmic" time (see Time zone § Worldwide time zones).

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