Gregorian Date to MJD (Modified Julian Date) Converter

Enter a Gregorian date and time to convert it to its equivalent Modified Julian Date (MJD).
MJD is defined as JD - 2400000.5, where JD is the Julian Date.

Year (e.g., 2000):

Month (1-12):

Day (1-31):

Hour (0-23):

Minute (0-59):

Second (0-59):

Modified Julian Date (MJD):

About Julian Date and Modified Julian Date:

Julian Date (JD): A continuous count of days and fractions thereof from noon Universal Time (UT) on January 1, 4713 BC (Proleptic Julian calendar). It's widely used in astronomy.
Modified Julian Date (MJD): Defined as JD - 2400000.5. MJD begins at midnight (00:00 UT) on November 17, 1858. It was introduced to have smaller, more manageable numbers and to start at midnight instead of noon, which is more convenient for many applications.