Iranian Calendars

Season Persian Month Appr. Equivalent Season Persian Month Appr. Equivalent
Farvardin 21 Mar–20 Apr Autumn
Mehr 23 Sep–22 Oct
Ordibehesht 21 Apr–21 May Aban 23 Oct–21 Nov
Khordad 22 May–21 Jun Azar 22 Nov–21 Dec
Tir 22 Jun–22 Jul Winter
Dei 22 Dec–20 Jan
Mordad 23 Jul–22 Aug Bahman 21 Jan–19 Feb
Shahrivar 23 Aug–22 Sep Esfand 20 Feb–20 Jan

Muslim Calendar
The Muslim calendar starts from the month before the Hejira and is based on the lunar year of 354 or 355 days, so it is out of step with the Persian solar calendar by some 40 years. The website converts Islamic (Hijri) dates to Western (Gregorian) ones and vice versa.

Zoroastrian Calendar
The Zoroastrian calendar works to a solar year of 12 months of 30 days each, with five additional days. The week has no place in this system, and each of the 30 days of the month is named after and presided over by its own angel or archangel. The 1st, 8th, 15th and 23rd of each month are holy days. As in the Persian calendar, the Zoroastrian year begins in March at the vernal equinox and except for Andarmaz, which replaces Esfand, the months are the same.