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 07 Vinerea Mare
April 09 Paștele
April 10 Paștele
May 01 Ziua Muncii
May 28 Rusaliile
May 29 A doua zi de Rusaliile
December 25 Craciun
December 26 A doua zi de Craciun
December 31 Ajunul de anul nou