is an option for time functions that specifies the time system being used to define time.
- Time systems are also known as time standards, time scales or time references.
- The time system indicates the physical process that determines how to measure the advance of time: atomic oscillations, the rotation of the Earth, some other astronomical phenomenon, etc.
- Choosing the appropriate time system is critical for precise time control. Errors of tens of seconds may accumulate over a few decades, or several hours over a few thousand years.
- The choice of time system is independent from the choice of calendar and the choice of time zone.
- Possible values for time systems include:
Automatic standard civil time, but not including leap seconds "TAI" atomic time, as measured by atomic clocks "TCB" solar system barycentric coordinate time "TCG" geocentric coordinate time "TDB","ET" solar system barycentric dynamical time, or ephemeris time "TT" terrestrial time, as measured at sea level on the Earth "UTC" coordinated universal time, including leap seconds "UT1" time proportional to the Earth's rotation angle "SmearedUTC" coordinated universal time, smearing leap seconds over the previous day
Examplesopen allclose all
Basic Examples (3)
Specify different time systems in a DateObject expression:
Properties & Relations (2)
Neat Examples (1)
Wolfram Research (2021), TimeSystem, Wolfram Language function, https://reference.wolfram.com/language/ref/TimeSystem.html.
Wolfram Language. 2021. "TimeSystem." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/TimeSystem.html.
Wolfram Language. (2021). TimeSystem. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/TimeSystem.html