Proleptic Julian calendar dates as Gregorian Dates, for rules like julian 12-25 (Orthodox Christmas).
Date
julian 12-25
The Gregorian date of a Julian calendar date.
@spec to_gregorian(integer(), 1..12, 1..31) :: Date.t()
iex> Dayoff.Calendar.Julian.to_gregorian(2026, 12, 25) ~D[2027-01-07] iex> Dayoff.Calendar.Julian.to_gregorian(2026, 1, 1) ~D[2026-01-14]