A Lilian date is the number of days since the beginning of the Gregorian calendar on October 15, 1582, regarded as Lilian date 1.
It was invented by Bruce G. Ohms of IBM in 1986 and is named for Aloysius Lilius, who devised the Gregorian Calendar.
It is currently used by date conversion routines that are part of IBM Language Environment (LE) software[2] and in IBM AIX COBOL.
The Julian date always begins at noon, Universal Time, and a decimal fraction may be used to represent the time of day.
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