Lilian date
From Wikipedia, the free encyclopedia
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 is named for Aloysius Lilius who devised the Gregorian Calendar. It was invented by Bruce G. Ohms of IBM in 1986.
It can be obtained from the Julian day number of the same date by subtracting 2299160. Lilian dates can be used to calculate the number of days between any two dates occurring since the beginning of the Gregorian calendar.
[edit] References
- Ohms, Bruce G (1986). "Computer processing of dates outside the twentieth centuryPDF (629 KiB)". IBM Systems Journal 25: 244–251. IBM.
