Julian Day Number from Date Calculator

Calculates Julian Day and Modified Julian Day numbers from Julian and Gregorian calendars.

Julian Day Number from Date
    1. Calendar  
    2. Julian Gregorian
    1. ,
    2. AD BC

Julian Day Number from Date
The Julian Day number is the number of days elapsed since noon (12:00) on January 1, 4713 BC
The Modified Julian Day number is the number of days since midnight on November 17, 1858 AD (MJD=JD-2400000.5)
The Gregorian calendar is used for dates on and after October 15, 1582 AD and the Julian calendar is used before October 4, 1582.

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