Article Detail International custom day Answer: 26 January Similar Questions : 1. Sanskrit Day Answer: 5th September 2. World Ozone Day Answer: 16 September 3. International Day of Solidarity with Palestinian People Answer: 29 November 4. World Post Office Day Answer: 9 October 5. World Standards Day Answer: 14 October 6. World Environment Protection Day Answer: 26 November 7. International Family Day Answer: 15 May Read more from - Important Days of Year