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.APPENDIX....: How Fdate Thinks About Dates
.ALIAS.......: HOFDTHAB
.DISCUSSION..:
Also,
see APPENDIX Fdate's Century-Assumption Algorithm
see APPENDIX Fdate's Leap Year Algorithm

FDATE'S BUSINESS VIEW OF THE CALENDAR
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FDATE is intended for business applications, not historical ones.

FDATE does not take into account historical changes in the calendar such as the ten days that were dropped from the British calendar when Britain moved from the Julian to the Gregorian calendar in the 18th century, or the 11 days that were dropped from the Russian calendar when Russia made the same move in the early 20th century.

As far as FDATE is concerned, the calendar has followed the same pattern, unchanged, since January 1, 0001.


FDATE'S BASE DATE
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Internally, Fdate's date manipulations are based on translating a calendar date into an "absolute" or "TRUE Julian" date: a date expressed as the number of days from some day in the distant past.