Just a sample site of a possible usage of DateTimeExtensions nuget package.
January 01 Anul Nou
January 02 A doua zi de Anul Nou
April 18 Vinerea Mare
April 20 Paștele
April 21 Paștele
May 01 Ziua Muncii
June 08 Rusaliile
June 09 A doua zi de Rusaliile
December 25 Craciun
December 26 A doua zi de Craciun
December 31 Ajunul de anul nou