Provides the type of time standards which JulianDate can take as input.
Represents the International Atomic Time (TAI) time standard. TAI is the principal time standard to which the other time standards are related.
Represents the coordinated Universal Time (UTC) time standard. UTC is related to TAI according to the relationship
UTC = TAI - deltaTwhere
deltaTis the number of leap seconds which have been introduced as of the time in TAI.