Public holidays in Serbia:

• January 1st and 2nd, New Year's Day
• January 7th, Julian Orthodox Christmas
• February 15th and 16th, Serbia National Day
• Varies, Orthodox Good Friday
• Varies, Orthodox Easter Monday
• May 1st and 2nd, International Workers' Day
• November 11th, Armistice Day

If one of the non-religious holidays falls on a Sunday, then the next working day is a non-working day.