Tranian official calendar, regulate according to Solar year & Iranian months.21 March, equal 1 Farvardin, is beginning of Iranian New Year. Also in Iran, Lunar calendar announce officially. Lunar year is 10 days less than Solar year ,so days of performing religious rites, that adjust according Lunar calendar, each year is different from next & former years.
Therefore it recommended to tourists that arrange their proper traveling time with related agency. Especially in Ramadan month that Iranian Muslim are fasting and in Muharram are mournful, so these situations influence on daily & current activities and somemdays in these two months are public holiday. Friday is official holiday.