Julian Date and Modified Julian Date converter
Convert a UTC timestamp to or from astronomical Julian Date and Modified Julian Date.
Preparing your tool…
How it works
Use JD = Unix milliseconds / 86400000 + 2440587.5 and MJD = JD − 2400000.5.
Example
2000-01-01T12:00:00Z maps to JD 2451545.0.
What should I check before using the result?
Uses POSIX UTC approximation; no leap-second, UT1 or TT correction. Not for precision ephemerides.