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Time Calculator

Initial Time
Final Time
Difference

Definitions

GPS Time is the number of seconds since January 6, 1980, 00:00:00

GAL Time (Galileo Time) is the number of seconds since August 22, 1999, 00:00:00

UNIX Time is the number of seconds since January 1, 1970, 00:00:00

Julian Date is the number of days since January 1, 4713 B.C., 12:00:00; defines the number of mean solar days elapsed since the epoch January 1.5d, 4713 before Christ (Hoffman-Wellenhof, 1994). All Julian dates are expressed in TT scale.

MJD (Modified Julian Date) is the number of days since January 1, 4713 B.C., 00:00:00, removing the first two digits. MJD=JD-24000000.5

MJD2000 (Modified Julian Date 2000) is the number of days since January 1, 2000, 00:00:00

Important note: leap seconds are only considered for UTC computation.

Leap second information is obtained from IANA.

Leap seconds to be updated December 2025. For latest leap second information check IERS Bulletin C.

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