public static bool IsVernalEquinoxDay(DateTime dateTime, bool ignoreStaleInfo = true)
{
if (dateTime.Month != 3)
{
return(false);
}
var equinoxDateTime = EquinoxDates.GetVernalEquinoxDateTime(dateTime.Year);
// Vernal Equinox DateTime in JST (UTC+9)
var eq = equinoxDateTime.AddHours(9);
return(IsDayOrTransferedHoliday(dateTime, eq.Day));
}
public static bool IsAutumnalEquinoxDay(DateTime dateTime)
{
if (dateTime.Year < 1948)
{
return(false);
}
if (dateTime.Month != 9)
{
return(false);
}
var equinoxDateTime = EquinoxDates.GetAutumnalEquinoxDateTime(dateTime.Year);
// Vernal Equinox DateTime in JST (UTC+9)
var eq = equinoxDateTime.AddHours(9);
return(IsDayOrTransferedHoliday(dateTime, eq.Day));
}