public static bool IsHoliday(DateTime date) { return (Holiday.IsNewYearsDay(date) || Holiday.IsNewYearsEve(date) || Holiday.IsPresidentsDay(date) || Holiday.IsGoodFriday(date) || Holiday.IsMemorialDay(date) || Holiday.IsIndependenceDay(date) || Holiday.IsLaborDay(date) || Holiday.IsThanksgivingDay(date) || Holiday.IsDayAfterThanksgiving(date) || Holiday.IsChristmasEve(date) || Holiday.IsChristmasDay(date)); }