Modified Julian Date Calculator
Convert between Gregorian calendar dates and Modified Julian Date (MJD). MJD = JD - 2400000.5, starting from midnight November 17, 1858.
Result
MJD: 61188.000000
Julian Date: 2461188.500000
MJD Integer: 61188
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.
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.