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  2. System time - Wikipedia

    en.wikipedia.org/wiki/System_time

    CURDATE() or CURRENT DATE CURTIME() or CURRENT TIME GETDATE() or GETUTCDATE() NOW() or CURRENT TIMESTAMP SYSDATE() 3 ms 1 January 1753 to 31 December 9999 (*) 60 s 1 January 1900 to 6 June 2079 Standard ML: Time.now() 1 μs (*) 1 January 1970 (*) TCL [clock seconds] 1 s 1 January 1970 [clock milliseconds] 1 ms [clock microseconds] 1 μs [clock ...

  3. Time formatting and storage bugs - Wikipedia

    en.wikipedia.org/wiki/Time_formatting_and...

    The last modification date stamp (and with DELWATCH 2.0+ also the file deletion date stamp, and since DOS 7.0+ optionally also the last access date stamp and creation date stamp), are stored in the directory entry with the year represented as an unsigned seven bit number (0–127), relative to 1980, and thereby unable to indicate any dates in ...

  4. 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.

  5. Epoch (computing) - Wikipedia

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

    Software timekeeping systems vary widely in the resolution of time measurement; some systems may use time units as large as a day, while others may use nanoseconds.For example, for an epoch date of midnight UTC (00:00) on 1 January 1900, and a time unit of a second, the time of the midnight (24:00) between 1 January 1900 and 2 January 1900 is represented by the number 86400, the number of ...

  6. Time to live - Wikipedia

    en.wikipedia.org/wiki/Time_to_live

    The original DARPA Internet Protocol's RFC describes [1]: §1.4 TTL as: . The Time to Live is an indication of an upper bound on the lifetime of an internet datagram.It is set by the sender of the datagram and reduced at the points along the route where it is processed.

  7. Jiffy (time) - Wikipedia

    en.wikipedia.org/wiki/Jiffy_(time)

    Jiffy values for various Linux versions and platforms have typically varied between about 1 ms and 10 ms, with 10 ms (1/100 s) reported as an increasingly common standard in the Jargon File. [ 11 ] Stratus VOS (Virtual Operating System) uses a jiffy of 1/65,536 second to express date and time (number of jiffies elapsed since 1 January 1980 00: ...

  8. Timestamp - Wikipedia

    en.wikipedia.org/wiki/Timestamp

    The term "timestamp" derives from rubber stamps used in offices to stamp the current date, and sometimes time, in ink on paper documents, to record when the document was received. Common examples of this type of timestamp are a postmark on a letter or the "in" and "out" times on a time card .

  9. Snowflake ID - Wikipedia

    en.wikipedia.org/wiki/Snowflake_ID

    Add the value to the X Epoch of 1288834974657 (in Unix time milliseconds), [5] the Unix time of the tweet is therefore 1656432460.105: June 28, 2022 16:07:40.105 UTC. The middle 10 bits 01 0111 1010 are the machine ID. The last 12 bits decode to all zero, meaning this tweet is the first tweet processed by the machine at the given millisecond.