private int GetDaysInFirstWeek(int year, JulianCalendarSystem calendar)
{
// Some of the first few days of the week year may be in the previous week year.
// However, the whole of the first week of the week year definitely occurs
// within the first 13 days of January.
return Enumerable.Range(1, 13)
.Count(day => new LocalDate(year, 1, day, calendar).WeekOfWeekYear == 1);
}
static JulianCalendarSystem()
{
instances = new JulianCalendarSystem[7];
for (int i = 0; i < 7; i++)
{
instances[i] = new JulianCalendarSystem(i + 1);
}
}