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  2. Eight-hour day - Wikipedia

    en.wikipedia.org/wiki/Eight-hour_day

    The eight-hour work day was introduced into law in Sweden on 4 August 1919, going into effect on 1 January 1920. [30] At the time, the work week was 48-hour since Saturday was a workday. The year before, 1918, the builders’ union had pushed through a 51-hour work week.

  3. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    Even in those countries where the 12-hour clock is predominant, there are frequently contexts (such as science, medicine, the military or transport) in which 24-hour clock is preferred. In most countries, however, the 24-hour clock is the standard system used, especially in writing. Some nations in Europe and Latin America use a combination of ...

  4. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    24-hour clock. A public 24-hour clock in Curitiba, Brazil, with the hour hand on the outside and the minute hand on the inside. The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00 (:00 ...

  5. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    Non-SI units. 60 min. Midnight to 1 a.m. on a 24-hour clock with a digital face. An hour (symbol: h; [1] also abbreviated hr) is a unit of time historically reckoned as 1⁄24 of a day and defined contemporarily as exactly 3,600 seconds (SI). There are 60 minutes in an hour, and 24 hours in a day.

  6. 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. September 10, 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 (7:12 pm). International date and time formats typically follow the ISO 8601 format (2024-09-10) for all-numeric dates, [3] write ...

  7. Date and time representation by country - Wikipedia

    en.wikipedia.org/wiki/Date_and_time...

    ISO 8601. International standard ISO 8601 (Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds. These standard notations have been adopted by many countries as a national standard, e.g ...

  8. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The first clock known to strike regularly on the hour, a clock with a verge and foliot mechanism, is recorded in Milan in 1336. [96] By 1341, clocks driven by weights were familiar enough to be able to be adapted for grain mills, [97] and by 1344 the clock in London's Old St Paul's Cathedral had been replaced by one with an escapement. [98]

  9. Singapore Time - Wikipedia

    en.wikipedia.org/wiki/Singapore_Time

    In 1981, Malaysia decided to standardise the time across its territories to a uniform UTC+08:00. Singapore elected to follow suit, citing business and travel schedules. [14] [15] The change took effect on New Year's Day (1 January) 1982 when Singapore moved half an hour forward on New Year's Eve (31 December) 1981 at 11:30 pm creating "Singapore Standard Time" (SST) or "Singapore Time" (SGT). [16]

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