From the “World days” package World Book Day 23 April, UNESCO's World Book and Copyright Day Historical confidence: Attested In nearby years 1403 Tuesday 4 Ordibehesht 1403 23 April 2024 1404 Wednesday 3 Ordibehesht 1404 23 April 2025 1405 Thursday 3 Ordibehesht 1405 23 April 2026 1406 Friday 3 Ordibehesht 1406 23 April 2027 1407 Sunday 4 Ordibehesht 1407 23 April 2028 Other occasions in this package New Year's DayValentine's DayInternational Women's DayPi DayEarth HourApril Fools' DayWorld Health DayEarth Day