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

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

    Times of day ending in :00 minutes may be pronounced as the numbered hour followed by o'clock (e.g., 10:00 as ten o'clock, 2:00 as two o'clock, 4:00 as four o'clock, etc.). This may be followed by the a.m. or p.m. designator, or might not be, if obvious. O'clock itself may be omitted, leaving a time such as four a.m. or four p.m.

  3. List of time zone abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zone...

    Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...

  4. 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]

  5. List of time zones by country - Wikipedia

    en.wikipedia.org/wiki/List_of_time_zones_by_country

    UTC+11:00 – Autonomous Region of Bougainville (Bougainville Standard Time) Portugal: 2: UTC−01:00 – Azores UTC+00:00 – Madeira and the Main territory of Portugal: Time in Portugal: South Africa: 2: UTC+02:00 (South African Standard Time) – Main territory of South Africa UTC+03:00 – Prince Edward Islands: Spain: 2: UTC+00:00 ...

  6. Time in the United States - Wikipedia

    en.wikipedia.org/wiki/Time_in_the_United_States

    Clocks are set ahead one hour at 2:00 a.m. on the following start dates and set back one hour at 2:00 a.m. on the corresponding end dates: Dates for daylight saving time Year

  7. Time in Massachusetts - Wikipedia

    en.wikipedia.org/wiki/Time_in_Massachusetts

    Independent of daylight saving time, solar noon on the March equinox is about 12:00 in Western Massachusetts and 11:47 in Nantucket to the east. New England, which includes Massachusetts, is one of the few areas in the United States where solar noon is before noon. United States time zones

  8. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    Most are based upon fractional days, so that one decimal time format may be easily converted into another, such that all the following are equivalent: 0.500 day; 5 heures décimales; @500.beats Swatch Internet Time ; 50.0 kes or cés (centidays) 500 millidays; 50.0% time as a percentage of the day; 12:00 standard time

  9. Date-time group - Wikipedia

    en.wikipedia.org/wiki/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).