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  2. Eastern Time Zone - Wikipedia

    en.wikipedia.org/wiki/Eastern_Time_Zone

    Since then, local times change at 2:00 a.m. EST to 3:00 a.m. EDT on the second Sunday in March, and return from 2:00 a.m. EDT to 1:00 a.m. EST on the first Sunday in November. [4] In Canada, daylight saving time begins and ends on the same days and at the same times as it does in the United States. [5] [6]

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

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

    Date Time Group format, used most often in operation orders. This format uses DDHHMMZMONYY, with DD being the two-digit day, HHMM being the time on a 24-hour clock, Z being the timezone code, MON being the three-letter month, and YY being the two-digit year. For example, 041200ZFEB23 is noon, UTC, on 4 Feb 2023. [13]

  4. 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 ...

  5. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    This is an accepted version of this page This is the latest accepted revision, reviewed on 5 December 2024. Primary time standard "UTC" redirects here. For the time zone between UTC−1 and UTC+1, see UTC+00:00. For other uses, see UTC (disambiguation). It has been suggested that UTC offset be merged into this article. (Discuss) Proposed since December 2024. Current time zones Coordinated ...

  6. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    American railroads maintained many different time zones during the late 19th century. Each train station set its own clock making it difficult to coordinate train schedules and confusing passengers. Time calculation became a serious problem for people traveling by train (sometimes hundreds of miles in a day), according to the Library of Congress.

  7. List of time offsets by U.S. state and territory - Wikipedia

    en.wikipedia.org/wiki/List_of_time_offsets_by_U...

    Map of U.S. time zones with new CST and EST areas displayed. Some U.S. time zones, such as the Samoa Time Zone, are not on this map. This is a list of the time offsets by U.S. states, federal district, and territories. For more about the time zones of the U.S. see time in the United States. Most states are entirely contained within one time zone.

  8. Time in Massachusetts - Wikipedia

    en.wikipedia.org/wiki/Time_in_Massachusetts

    Time in Massachusetts, as in all US states, is regulated by the United States Department of Transportation. [1] ... (EST) UTC−05:00: Daylight time (summer)

  9. List of UTC offsets - Wikipedia

    en.wikipedia.org/wiki/List_of_UTC_offsets

    The main purpose of this page is to list the current standard time offsets of different countries, territories and regions. Information on daylight saving time or historical changes in offsets can be found in the individual offset articles (e.g. UTC+01:00) or the country-specific time articles (e.g. Time in Russia).