Guides
Calendar guides
Everything you need to understand the Persian and Gregorian calendars — and to convert between them with confidence. Short, sourced and written for real questions.
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Persian calendar explained
How the Solar Hijri calendar works: months, seasons, leap years and its history. -
Gregorian calendar explained
The calendar most of the world uses, its 1582 reform and the 4-100-400 leap rule. -
Persian vs Gregorian
Year numbers, New Year dates, leap years and months, side by side. -
Nowruz & the Persian New Year
Why Nowruz is tied to the March equinox and why its Gregorian date moves. -
Date conversion guide
Convert birthdays and document dates correctly, avoid common mistakes, and read the FAQ. -
Calendar fun facts
Vanishing days, 33-year cycles, Friday the 13th and more surprising calendar facts.