Iran’s official calendar is the Solar Hejri Calendar (SH), beginning at the vernal equinox in the Northern Hemisphere, which was first enacted by the Iranian Parliament on March 31, 1925. Each of the 12 months of the Solar Hejri calendar correspond with a zodiac sign, and the length of each year is absolutely solar. The months are named after the ancient Iranian months, namely: Farvardin (Fravaši), Ordibehešt (Aša Vahišta), Xordād (Haurvatāt),Tir (Tištrya), Āmordād (Amərətāt), Šahrivar (Xšaθra Vairya), Mehr (Miθra), Ābān (Āpō), Āzar (Ātar),Dey (Daθuš), Bahman (Vohu Manah), Esfand (Spəntā Ārmaiti).
The Solar Hejri Calendar is used to indicate Legal public holidays remarks the domestic events such as:
The cultural celebrations of Nowrouz (Farvardin 1–4; March 21–24)
The political events of Islamic Republic Day (Farvardin 12; April 1)
Sizdah-bedar (Farvardin 13; April 2)
The death of Ayatollah Rouhollah Khomeini day (Khordad 14; June 4)
The Khordad 15 event (Khordad 15; June 5)
The anniversary of the 1979 Revolution (Bahman 22; February 10)
Oil Nationalization Day (Esfand 29; March 19).
The Lunar Hejri Calendar (AH) alternatively, is used to indicate Islamic events, and the Gregorian calendar remarks the international events such as:
Tasua day (Muharram 9; September 30)
Ashura day (Muharram 10; October 1)
Arba’een day (Safar 20; November 10)
The death of prophet Mohammad (PBUH )(Safar 28; November 17)
The death of Ali Ebn-e Musa al-Reza (AS) (Safar 29 or 30; November 18)
The birthday of prophet Mohammad (PBUH) (Rabi-al-Awwal 17; December 6)
The death of Fatimah al-Zahra (SA) the only child of the Islamic prophet Mohammad (Jamadi-al-Thani 3; March 2)
The birthday of Ali Ebn-e Abi-Taleb (AS) (Rajab 13; April 10)
Prophet Mohammad’s (PBUH) first revelation (Rajab 27; April 24)
The birthday of Mohammad Ebn-e Hasan Al-Asgari (Imam Mahdi) \ (AS) (Sha’ban 15; May 12)
The death of Imam Ali Ebn-e Abi-Taleb (Ramadan 21; June 16)
Eid-e (eve) Fetr (Shawwal 1–2; June 26–27)
The death of Imam Ja’far al-Sadeq (as) (Shawwal 25; July 20)
Eid-e Qorban (Zol-Hajjeh 10; September 1)
Eid-e Qadir (Zol-Hajjeh 18; September 9)
Working Days & Hours
Working days in Iran start from Saturday to Wednesday
Weekend is on Thursday and Friday.
Weekly holiday is Friday in most cities but in Tehran it embodied Thursday too.
Working hour starts from 08:00 and finishes in 16:00 (Saturday to Wednesday), and from 08:00 to 13:00 in Tuesday.