The Julian day or Julian day number (JDN) is the integer number of days that have elapsed since the initial epoch defined as noon Universal Time (UT) Monday, January 1, 4713 BC in the proleptic Julian calendar.

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The use of Julian date to refer to the day-of-year (ordinal date) is usually considered to be incorrect, however it is widely used that way in the earth sciences and computer programming.

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In reply to Re: Very Simple Conversion of Gregorian to Julian Calendar by Fletch
in thread Very Simple Conversion of Gregorian to Julian Calendar by Aim9b

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