Create a GEDCOM Gregorian Date object
Arguments
- year
The year given as an integer (not 0). Negative years are interpreted
as Before the Common Era (BCE). If BCE, only year should be provided.
- month
The month of the year given as an integer between 1 and 12.
- day
The day of the month given as an integer between 1 and 31.
Value
An S7 object representing a GEDCOM Gregorian Date.