From the “World days” package Earth Hour The last Saturday of March, a voluntary hour of switching off lights in support of the environment Historical confidence: Attested In nearby years 1403 Saturday 11 Farvardin 1403 30 March 2024 1404 Saturday 9 Farvardin 1404 29 March 2025 1405 Saturday 8 Farvardin 1405 28 March 2026 1406 Saturday 7 Farvardin 1406 27 March 2027 1407 Saturday 6 Farvardin 1407 25 March 2028 Other occasions in this package New Year's DayValentine's DayInternational Women's DayPi DayApril Fools' DayWorld Health DayEarth DayWorld Book Day