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TDT Time Display Converter

The time is the UTC date and time that is seen by the browser on your computer. These scales will be as accurate as your computer's clock. UTC, Coordinated Universal Time, popularly known as GMT (Greenwich Mean Time), or Zulu time. Local time differs from UTC by the number of offset, + or -, hours of your timezone. Terrestrial Dynamical Time (TDT) is dynamical time for geocentric phenomena which replaced Ephemeris Time when the IAU 1976 System of Astronomical Constants was implemented in the Astronomical Almanac in 1984. TDT is independent of the variable rotation of the Earth, and the lengths of the tropical year and synodic month are generally defined in days of 86,400 seconds of international atomic time. TDT is used as the time scale of ephemerides for observations from Earth's surface, and differs from international atomic time (TAI) by an offset of 32.184 seconds (TDT=TAI + 32.184), which varies slightly with time. TAI, Temps Atomique International, is the international atomic time scale based on a continuous counting of the SI second. TAI is currently ahead of UTC by A different methodology and view is available in our International Time Display. This is a real-time display with no user input functions. You may do manual conversions with our BMT and Internet Time Converter. You can also view our International Time Zone Map. This converter requires the use of Javascript enabled and capable browsers. You may also wish to compare TDT to several other time formats at our Multiple Time Display Converter.

Terrestrial Dynamical Time


Updated 6.07.11

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