Article Detail World Post Office Day Answer: 9 October Similar Questions : 1. Ordnance Factories Day Answer: 18th March 2. National Voters day Answer: 25 January 3. Minorities Rights Day Answer: 18 December 4. World Environment Protection Day Answer: 26 November 5. Valentine Day Answer: 14 February 6. National youth day Answer: 12th January. It is celebrated on the birthday of swami Vivekanand ji 7. Engineer's Day Answer: 15 September Read more from - Important Days of Year