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  2. Year 2038 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2038_problem

    Many computer systems measure time and date using Unix time, an international standard for digital timekeeping. Unix time is defined as the number of seconds elapsed since 00:00:00 UTC on 1 January 1970 (an arbitrarily chosen time based on the creation of the first Unix system), which has been dubbed the Unix epoch. [6]

  3. Fact table - Wikipedia

    en.wikipedia.org/wiki/Fact_table

    The periodic snapshot, as the name implies, takes a "picture of the moment", where the moment could be any defined period of time, e.g. a performance summary of a salesman over the previous month. A periodic snapshot table is dependent on the transactional table, as it needs the detailed data held in the transactional fact table in order to ...

  4. System time - Wikipedia

    en.wikipedia.org/wiki/System_time

    (get-universal-time) [44] 1 s 1 January 1900 Smalltalk: Time microsecondClock (VisualWorks) 1 s (ANSI) 1 μs (VisualWorks) 1 s (Squeak) 1 January 1901 (*) Time totalSeconds (Squeak) SystemClock ticksNowSinceSystemClockEpoch (Chronos) SQL: CURDATE() or CURRENT DATE CURTIME() or CURRENT TIME GETDATE() or GETUTCDATE() NOW() or CURRENT TIMESTAMP ...

  5. Moment (unit) - Wikipedia

    en.wikipedia.org/wiki/Moment_(unit)

    A moment (momentum) is a medieval unit of time. The movement of a shadow on a sundial covered 40 moments in a solar hour , a twelfth of the period between sunrise and sunset . The length of a solar hour depended on the length of the day, which, in turn, varied with the season . [ 1 ]

  6. List of tz database time zones - Wikipedia

    en.wikipedia.org/wiki/List_of_tz_database_time_zones

    Xinjiang Time Canonical +06:00 +06:00 +06 asia The Asia/Urumqi entry in the tz database reflected the use of Xinjiang Time by part of the local population. Consider using Asia/Shanghai for Beijing Time if that is preferred. RU: Asia/Ust-Nera: MSK+07 - Oymyakonsky Canonical +10:00 +10:00 +10 europe LA: Asia/Vientiane: Link † +07:00 +07:00 +07 ...

  7. Censoring (statistics) - Wikipedia

    en.wikipedia.org/wiki/Censoring_(statistics)

    A common misconception with time interval data is to class as left censored intervals where the start time is unknown. In these cases we have a lower bound on the time interval, thus the data is right censored (despite the fact that the missing start point is to the left of the known interval when viewed as a timeline!).

  8. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. 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 1 January 1970, the Unix epoch. For example, at midnight on 1 January 2010, Unix time was 1262304000. Unix time originated as the system time of Unix operating systems.