The Iranian government changed the first year of the Iranian solar calendar from the Islamic hijri to the ascension to the throne by Cyrus the Great.

The Iranian calender is also referred to as the Persian calender. In it, the month of Mehr is the 7th month, thus the month of July, on the Iranian/Persian calender.

The Iranian (Persian) Calendar, is the most accurate and one of the oldest (as far back as 2000 BC Zoroastrianism) calendars.

he described Pascals triangle 500 years prior to Pascal. He also developed the Iranian calendar, a.k.a. the Jalali calendar which was more accurate than the Gregorian calendar.

Because it is a written law in Iranian Constitution. Any foreign woman married to a man who is an Iranian citizen, will automatically receive Iranian citizenship- whether you want it or not. They not required to renounce their foreign nationality. However, they are recognized only as Iranian based on Iranian government point of view.
You should then apply for an Iranian certificate of identity, a national ID card and an Iranian passport.