Persian and Zoroastrian Wedding Dates.
The Iranian calendar is the most astronomically accurate in civil use anywhere, and the Zoroastrian calendars are among the oldest still followed — with the complication that there are three of them, running weeks apart.
The calendar
The Solar Hijri year begins at the March equinox as observed from the meridian of Iran Standard Time, which makes it astronomically exact but not reducible to a simple leap-year rule. The Zoroastrian calendars — Shahanshahi, Kadmi and Fasli — share a 12×30-day structure plus five Gatha days, but only Fasli intercalates, so the other two drift about a day every four years.
The rules
- Muharram and Safar
- Avoided across Shia Iran for the mourning of Imam Husayn and Arbaeen, though scholarship holds the contract itself permitted, provided the celebration is not disrespectful.
- Ramadan
- Generally avoided for the celebration.
- Nowruz
- The new year, and a genuinely auspicious time to marry — a new cycle for a new life. Also a public holiday across Iran, Afghanistan and Central Asia.
- Roj days
- Hormazd (1st) and Behram (20th) are the traditional Zoroastrian wedding days.
What can be worked out, and what cannot
A calendar can determine
- Nowruz, exactly, from the equinox at the Tehran meridian
- Solar Hijri conversion, given a real ephemeris
- The roj and mah for any date, in all three Zoroastrian calendars
Only family custom, mostly can decide
Which Zoroastrian calendar your family follows — Indian Parsis generally keep Shahanshahi, Iranian Zoroastrians and most Western communities Fasli. Some families also consult an astrologer, though sources note this is borrowed practice rather than standard.
A common claim, corrected
The Iranian calendar follows a 33-year leap cycle you can compute from a formula.
It does not. The year begins at the actual equinox observed from a specific meridian, and the leap pattern includes irregular subcycles. Published predictive algorithms — including the popular 33-year rule found in most code libraries — disagree with the official Iranian calendar in specific years. If a date matters, check it against an official source rather than a converter.
The Zoroastrian community is small — perhaps 100,000 to 120,000 worldwide — and correspondingly underserved by every tool that exists.