BIPM Time Dept database

BIPM Time Department Data Base
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International reference time scales (from BIPM) :

TT(BIPM) : realization of Terrestrial Time TT(BIPM) is a realization of Terrestrial Time as defined by the International Astronomical Union (IAU).
It is computed annually by the BIPM, based on a weighted average of the evaluations of the frequency of TAI by the primary and secondary frequency standards.
It is mostly used in scientific applications requiring long-term frequency stability and high frequency accuracy.

Time scales relationship (from BIPM) :

Differences between the normalized frequencies of EAL and TAI , since the beginning of the steering, in 1977.

Time scales relationship (from IERS)

Differences between UTC and TAI :

Leap seconds

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