Julian Day Calculation
Calculate the modified Julian day and Julian day from the Julian or Gregorian calendar.
Julian day 0 is noon (12:00) on January 1, 4713 BC. Modified Julian day 0 is November 17, AD 1858 at 00:00.
Modified Julian day = Julian day − 2400000.5.
AD 1 follows BC 1; there is no BC 0 or AD 0 in historical year numbering.
The Gregorian calendar was introduced on October 15, 1582.
Modified Julian day = Julian day − 2400000.5.
AD 1 follows BC 1; there is no BC 0 or AD 0 in historical year numbering.
The Gregorian calendar was introduced on October 15, 1582.
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