Construct a DATE_CALENDAR string
The year.
The month number.
The day number.
If the year is given without a day or month, whether it should be interpreted as being before the Common Era.
If the year is given with a month, whether to interpret the year as the first part of a dual year (only for English dates pre-1752). If TRUE, it will transform a year of 1745 to 1745/46.
A DATE_CALENDAR string.