Modified Julian Date Calculator

Convert between Gregorian calendar dates and Modified Julian Date (MJD). MJD = JD - 2400000.5, starting from midnight November 17, 1858.

Year

Month

Day

Hour (UTC)

Minute

Second

Result

MJD: 61071.000000

Julian Date: 2461071.500000

MJD Integer: 61071

Day Fraction: 0.000000

About Modified Julian Date

The Modified Julian Date (MJD) is a modification of the Julian Date that starts at midnight (rather than noon) and uses a smaller number. MJD = JD - 2400000.5. The epoch is November 17, 1858 at 00:00 UTC. MJD is widely used in satellite tracking, GPS systems, and space missions.