Поиск Holydays asp.net
var publicHolidays = DateSystem.GetPublicHoliday(2018, CountryCode.DE);
Poised Parrot
var publicHolidays = DateSystem.GetPublicHoliday(2018, CountryCode.DE);PM> install-package Nager.Datevar date = new DateTime(2018, 01, 01);
if (DateSystem.IsPublicHoliday(date, CountryCode.DE))
{
//Yes - New Year's Day
}