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  2. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    Time kept in this fashion is sometimes referred to as "TAI" (although timestamps can be converted to UTC if the value corresponds to a time when the difference between TAI and UTC is known), as opposed to "UTC" (although not all UTC time values have a unique reference in systems that do not count leap seconds). [8]

  3. Timestamp - Wikipedia

    en.wikipedia.org/wiki/Timestamp

    A distinction is sometimes made between the terms datestamp, timestamp and date-timestamp: Datestamp or DS: A date, for example 2025-01-25 according to ISO 8601; Timestamp or TS: A time of day, for example 17:02:46 using 24-hour clock; Date-timestamp or DTS: Date and time, for example 2025-01-25, 17:02:46

  4. C date and time functions - Wikipedia

    en.wikipedia.org/wiki/C_date_and_time_functions

    computes the difference in seconds between two time_t values time: returns the current time of the system as a time_t value, number of seconds, (which is usually time since an epoch, typically the Unix epoch). The value of the epoch is operating system dependent; 1900 and 1970 are often used. See RFC 868. clock

  5. Network Time Protocol - Wikipedia

    en.wikipedia.org/wiki/Network_Time_Protocol

    Reference Timestamp: 64 bits Time when the system clock was last set or corrected, in NTP timestamp format. ... difference in absolute time between the two clocks. It ...

  6. Leap second - Wikipedia

    en.wikipedia.org/wiki/Leap_second

    Screenshot of the UTC clock from time.gov during the leap second on 31 December 2016.. A leap second is a one-second adjustment that is occasionally applied to Coordinated Universal Time (UTC), to accommodate the difference between precise time (International Atomic Time (TAI), as measured by atomic clocks) and imprecise observed solar time (), which varies due to irregularities and long-term ...

  7. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    It is impossible to compute the exact time interval elapsed between two UTC timestamps without consulting a table showing how many leap seconds occurred during that interval. By extension, it is not possible to compute the precise duration of a time interval that ends in the future and may encompass an unknown number of leap seconds (for ...

  8. Timestamp-based concurrency control - Wikipedia

    en.wikipedia.org/wiki/Timestamp-based...

    This is the minimum time elapsed between two adjacent timestamps. If the resolution of the timestamp is too large (coarse), the possibility of two or more timestamps being equal is increased and thus enabling some transactions to commit out of correct order.

  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).