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  2. System time - Wikipedia

    en.wikipedia.org/wiki/System_time

    System time. In computer science and computer programming, system time represents a computer system's notion of the passage of time. In this sense, time also includes the passing of days on the calendar. System time is measured by a system clock, which is typically implemented as a simple count of the number of ticks that have transpired since ...

  3. Epoch (computing) - Wikipedia

    en.wikipedia.org/wiki/Epoch_(computing)

    Epoch (computing) In computing, an epoch is a fixed date and time used as a reference from which a computer measures system time. Most computer systems determine time as a number representing the seconds removed from a particular arbitrary date and time. For instance, Unix and POSIX measure time as the number of seconds that have passed since ...

  4. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    Unix time[a] is a date and time representation widely used in computing. It measures time by the number of non- leap seconds that have elapsed since 00:00:00 UTC on 1st January 1970, the Unix epoch. In modern computing, values are sometimes stored with higher granularity, such as microseconds or nanoseconds.

  5. Real-time clock - Wikipedia

    en.wikipedia.org/wiki/Real-time_clock

    A real-time clock (RTC) is an electronic device (most often in the form of an integrated circuit) that measures the passage of time. Although the term often refers to the devices in personal computers, servers and embedded systems, RTCs are present in almost any electronic device which needs to keep accurate time of day.

  6. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    The year 2038 problem (also known as Y2038, [1] Y2K38, Y2K38 superbug or the Epochalypse[2][3]) is a time computing problem that leaves some computer systems unable to represent times after 03:14:07 UTC on 19 January 2038. The problem exists in systems which measure Unix time —the number of seconds elapsed since the Unix epoch (00:00:00 UTC ...

  7. Network Time Protocol - Wikipedia

    en.wikipedia.org/wiki/Network_Time_Protocol

    v. t. e. The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable- latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was designed by David L. Mills of the University of Delaware.

  8. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    Ordinal date. 2024‐252. ISO 8601 is an international standard covering the worldwide exchange and communication of date and time -related data. It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]

  9. 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 7, 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 (8:12 pm). International date and time formats typically follow the ISO 8601 format (2024-09-07) for all-numeric dates, [3] write ...

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