From the “World days” package Pi Day 14 March (written 3/14 in American date format), an informal celebration of the number π among maths enthusiasts Historical confidence: Attested In nearby years 1403 Friday 24 Esfand 1403 14 March 2025 1404 Saturday 23 Esfand 1404 14 March 2026 1405 Sunday 23 Esfand 1405 14 March 2027 1406 Tuesday 24 Esfand 1406 14 March 2028 1407 Wednesday 24 Esfand 1407 14 March 2029 Other occasions in this package New Year's DayValentine's DayInternational Women's DayEarth HourApril Fools' DayWorld Health DayEarth DayWorld Book Day