GNSS Time Calculator

Initial Time
Final Time
Difference

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]

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: No leap seconds are considered in the computations except for TAI and TT

Leap seconds to be updated December 2023

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