DateTimeExtensions
Just a sample site of a possible usage of DateTimeExtensions nuget package.
Polska (pl-PL) change
Holidays
January 01 New Year
January 06 Epiphany
April 18 Easter
April 19 Easter Monday
May 01 International Workers' day
May 03 May 3rd Constitution Day
June 06 Pentecost
June 17 Corpus Christi
August 15 Assumption
November 01 All Saints
November 11 National Independence Day
December 25 Christmas
December 26 St Stephen's Day