public override bool isBusinessDay(Date date)
{
DayOfWeek w = date.DayOfWeek;
int d = date.Day, dd = date.DayOfYear;
Month m = (Month)date.Month;
int y = date.Year;
// equinox calculation
double exact_vernal_equinox_time = 20.69115;
double exact_autumnal_equinox_time = 23.09;
double diff_per_year = 0.242194;
double moving_amount = (y - 2000) * diff_per_year;
int number_of_leap_years = (y-2000)/4+(y-2000)/100-(y-2000)/400;
int ve = (int)( exact_vernal_equinox_time + moving_amount - number_of_leap_years);// vernal equinox day
int ae = (int)( exact_autumnal_equinox_time + moving_amount - number_of_leap_years ); // autumnal equinox day
// checks
if (isWeekend(w)
// New Year's Day
|| (d == 1 && m == Month.January)
// Bank Holiday
|| (d == 2 && m == Month.January)
// Bank Holiday
|| (d == 3 && m == Month.January)
// Coming of Age Day (2nd Monday in January),
// was January 15th until 2000
|| (w == DayOfWeek.Monday && (d >= 8 && d <= 14) && m == Month.January
&& y >= 2000)
|| ((d == 15 || (d == 16 && w == DayOfWeek.Monday)) && m == Month.January
&& y < 2000)
// National Foundation Day
|| ((d == 11 || (d == 12 && w == DayOfWeek.Monday)) && m == Month.February)
// Vernal Equinox
|| ((d == ve || (d == ve + 1 && w == DayOfWeek.Monday)) && m == Month.March)
// Greenery Day
|| ((d == 29 || (d == 30 && w == DayOfWeek.Monday)) && m == Month.April)
// Constitution Memorial Day
|| (d == 3 && m == Month.May)
// Holiday for a Nation
|| (d == 4 && m == Month.May)
// Children's Day
|| ((d == 5 || (d == 6 && w == DayOfWeek.Monday)) && m == Month.May)
// Marine Day (3rd Monday in July),
// was July 20th until 2003, not a holiday before 1996
|| (w == DayOfWeek.Monday && (d >= 15 && d <= 21) && m == Month.July
&& y >= 2003)
|| ((d == 20 || (d == 21 && w == DayOfWeek.Monday)) && m == Month.July
&& y >= 1996 && y < 2003)
// Respect for the Aged Day (3rd Monday in September),
// was September 15th until 2003
|| (w == DayOfWeek.Monday && (d >= 15 && d <= 21) && m == Month.September
&& y >= 2003)
|| ((d == 15 || (d == 16 && w == DayOfWeek.Monday)) && m == Month.September
&& y < 2003)
// If a single day falls between Respect for the Aged Day
// and the Autumnal Equinox, it is holiday
|| (w == DayOfWeek.Tuesday && d + 1 == ae && d >= 16 && d <= 22
&& m == Month.September && y >= 2003)
// Autumnal Equinox
|| ((d == ae || (d == ae + 1 && w == DayOfWeek.Monday)) && m == Month.September)
// Health and Sports Day (2nd Monday in October),
// was October 10th until 2000
|| (w == DayOfWeek.Monday && (d >= 8 && d <= 14) && m == Month.October
&& y >= 2000)
|| ((d == 10 || (d == 11 && w == DayOfWeek.Monday)) && m == Month.October
&& y < 2000)
// National Culture Day
|| ((d == 3 || (d == 4 && w == DayOfWeek.Monday)) && m == Month.November)
// Labor Thanksgiving Day
|| ((d == 23 || (d == 24 && w == DayOfWeek.Monday)) && m == Month.November)
// Emperor's Birthday
|| ((d == 23 || (d == 24 && w == DayOfWeek.Monday)) && m == Month.December
&& y >= 1989)
// Bank Holiday
|| (d == 31 && m == Month.December)
// one-shot holidays
// Marriage of Prince Akihito
|| (d == 10 && m == Month.April && y == 1959)
// Rites of Imperial Funeral
|| (d == 24 && m == Month.February && y == 1989)
// Enthronement Ceremony
|| (d == 12 && m == Month.November && y == 1990)
// Marriage of Prince Naruhito
|| (d == 9 && m == Month.June && y == 1993))
return false;
return true;
}
