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  2. Philippine Standard Time - Wikipedia

    en.wikipedia.org/wiki/Philippine_Standard_Time

    [6] [7] At the time, local mean time was used to set clocks, meaning that every place used its own local time based on its longitude because the time was measured by locally observing the Sun. Philippine Standard Time was instituted through Batas Pambansa Blg. 8 (that defined the metric system ), approved on December 2, 1978, and implemented on ...

  3. 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 ...

  4. Time zone - Wikipedia

    en.wikipedia.org/wiki/Time_zone

    Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.

  5. Daylight saving time by country - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time_by...

    Daylight saving time by country. Daylight saving time (DST), also known as summer time, is the practice of advancing clocks during part of the year, typically by one hour around spring and summer, so that daylight ends at a later time of the day. As of 2024, DST is observed in most of Europe, most of North America and parts of Africa and Asia ...

  6. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    Definition. Unix time is currently defined as the number of non-leap seconds which have passed since 00:00:00 UTC on Thursday, 1 January 1970, which is referred to as the Unix epoch. [ 3] Unix time is typically encoded as a signed integer . The Unix time 0 is exactly midnight UTC on 1 January 1970, with Unix time incrementing by 1 for every non ...

  7. Daylight saving time in Asia - Wikipedia

    en.wikipedia.org/wiki/Daylight_saving_time_in_Asia

    The British first instituted summer time in Egypt in 1940, during the Second World War.The practice was stopped after 1945, but resumed 12 years later, in 1957. [1]Before the revolution in January 2011, the government was planning to take a decision to abolish summer time in 2011 before President Hosni Mubarak's term expires in September 2011.

  8. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock can be traced back as far as Mesopotamia and ancient Egypt. [7] Both an Egyptian sundial for daytime use [8] and an Egyptian water clock for night-time use were found in the tomb of Pharaoh Amenhotep I. [9] Dating to c. 1500 BC, these clocks divided their respective times of use into 12 hours each.

  9. Fastest Clock in the World tells time to the microsecond

    www.engadget.com/2008-06-27-fastest-clock-in-the...

    Since no display can refresh a million times a second (and no eye can comprehend that kind of data), Yauner's concept lets you peer into the moment by hitting pause. Just note that by the time you ...