Julian Day from Western calendar date Calculator

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Calculates Julian Day and Modified Julian Day from Western calendar date.

Julian Day from Western calendar date
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The Julian Day is the number of days that have elapsed since noon (12:00) on January 1, 4713 B.C.
The Modified Julian Day is the number of days since midnight (00:00) on November 17, 1858 A.D. (MJD=JD-2400000.5)
The Gregorian calendar is used for dates on and after October 15, 1582 A.D. and the Julian calendar is used before October 4, 1582.

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