Calendar

As in all the Moslem Countries, also in Iran the calendar
starts the calculation of the years from the Egira (622
AD), from when that is the prophet Mohammed from the Mecca
migrated to Medina. But in Iran it is a solar calendar while
in the Arabic Countries it is lunar. Then the base is equal
but it changes the calculation of the years.
the Iranian year begins on March 21, first day in spring,
with the feast of the Nowruz, the most important of the
whole year.
The first six months have 31 days, the five followings have
30, while the last, the twelfth one, has 29 (or 30 in the
leap years). 1) Farvardin: (31 days), from on March 21 to
April 20
2) Ordibehesht: (31 days), from on April 21 to May 21
3) Khordad: (31 days), from on May 22 to June 21
4) Tir: (31 days), from on June 22 to July 22
5) Mordad: (31 days), from on July 23 to August 22
6) Shahrivar: (31 days), from on August 23 to September
22
7) Mehr: (30 days), from on September 23 to October 22
8) Aban: (30 giomis), from on October 23 to November 21
9) Azar: (30 days), from on November 22 to December 21
10) Dey: (30 days), from on December 22 to January 20
11) Bahman: (30 days), from on January 21 to February 19
12) Esfand: (29/30 days), from on February 20 to March 20
The Islamic calendar in the Arabic Countries is tightly
lunar. Year consists of twelve alternate months of 30 or
29 days but the last month in a few years can be also of
30 days. Therefore the year can last 354 or 355 days. So
in the Moslem calendar, in comparison to the Iranian calendar
or to that western, every year begins 10, 11 or 12 days
before.
The Moslem months are:
1) Moharram (The month of Imam Hossein martyrdom)
2) Safar
3) Rabi-ol Avval
4) Rabiossani
5) Jamadi-ol Avval
6) Jamadiossani
7) Rajab
8) Shaban
9) Ramadan or Ramazan (the month of the fast)
10) Sbaval
11) Zighadeh
12) Zihajjeh (the month of the ceremonies to the Mecca)
  The religious celebrations follow the variations of the lunar calendar, while
the national festivities are fixed with the solar calendar.
  The numbers

0 Sefr 30 Si 6000 Shesh-hezaar
1 Yek 40 Chehel 7000 Haft-hezaar
2 Du 50 Panjaah 8000 Hasht-hezaar
3 Seh 60 Shast 9000 Noh-hezaar
4 Chahar 70 Haftaad 10.000 Dah-hezaar
5 Panj 80 Hashtaad 100.000 Sad-hezaar
6 Shesh 90 Navad 1000.000 Yek-milioon
7 Haft 100 Sad 10.000.000 Dah-milioon
8 Hasht 200 Devist 100.000.000 Sad-milioon
9 Noh 300 Sisad 1000.000.000 Yek-meliaard
10 Dah 400 Chahar-sad    
11 Yazdah 500 Pan-sad    
12 Davaazdah 600 Shesh-sad    
13 Sisdah 700 Haft-sad    
14 Chahardah 800 Hasht-sad    
15 Panzdah 900 Noh-sad    
16 Shanzdah 1000 Hezaar    
17 Hefdah 2000 Dv-hezaar    
18 Hejdah 3000 Seh-hezaar    
19 Nvzdah 4000 Chahar-hezaar    
20 Bist 5000 Panj-hezaar    
Colors          
Black Siah White Sefid Green Sabz
Red Germez Yellow Zard Blu Abi
Brown Ghahveii Cream Kerem Violet Banafsh