Year B.C. of the Gregorian Calendar counting year 0 as 1 B.C.
The year B.C. to set this Date's year to.
std.datetime.date.DateTimeException if a non-positive value is given.
auto date = Date(2010, 1, 1); date.yearBC = 1; assert(date == Date(0, 1, 1)); date.yearBC = 10; assert(date == Date(-9, 1, 1));
See Implementation
Year B.C. of the Gregorian Calendar counting year 0 as 1 B.C.