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  2. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    One quadrillionth of a second. Pulse time on fastest lasers. svedberg: 10 −13 s: Time unit used for sedimentation rates (usually of proteins). picosecond: 10 −12 s: One trillionth of a second. nanosecond: 10 −9 s: One billionth of a second. Time for molecules to fluoresce. shake: 10 −8 s: 10 nanoseconds, also a casual term for a short ...

  3. Unix time - Wikipedia

    en.wikipedia.org/wiki/Unix_time

    Unix time numbers are repeated in the second immediately following a positive leap second. The Unix time number 1 483 228 800 is thus ambiguous: it can refer either to start of the leap second (2016-12-31 23:59:60) or the end of it, one second later (2017-01-01 00:00:00). In the theoretical case when a negative leap second occurs, no ambiguity ...

  4. Coordinated Universal Time - Wikipedia

    en.wikipedia.org/wiki/Coordinated_Universal_Time

    The current version of UTC is defined by International Telecommunication Union Recommendation (ITU-R TF.460-6), Standard-frequency and time-signal emissions, [39] and is based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the accumulated difference between TAI and time measured by Earth's ...

  5. Time in physics - Wikipedia

    en.wikipedia.org/wiki/Time_in_physics

    The smallest time step considered theoretically observable is called the Planck time, which is approximately 5.391×10 −44 seconds – many orders of magnitude below the resolution of current time standards.

  6. Second - Wikipedia

    en.wikipedia.org/wiki/Second

    The second (symbol: s) is a unit of time, historically defined as 1 ⁄ 86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400).

  7. Swatch Internet Time - Wikipedia

    en.wikipedia.org/wiki/Swatch_Internet_Time

    Those without a watch can use the Internet to view the current time, [1] originally on the watchmaker's website. The concept is similar to decimal minutes in French Revolutionary decimal time. [2] Instead of hours and minutes, the mean solar day is divided into 1,000 parts called .beats. Each .beat lasts 86.4 seconds (1.440 minutes) in standard ...

  8. Time - Wikipedia

    en.wikipedia.org/wiki/Time

    Planck time (~ 5.4 × 10 −44 seconds) is the unit of time in the system of natural units known as Planck units. Current established physical theories are believed to fail at this time scale, and many physicists expect that the Planck time might be the smallest unit of time that could ever be measured, even in principle.

  9. Template:CURRENTSECOND - Wikipedia

    en.wikipedia.org/wiki/Template:CURRENTSECOND

    This template extracts the current integer second on two digits (between 00 and 59) from the current UTC time (as set on the Wikimedia server). The shown value should match the rightmost two digits of 20241218054336.