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Iranian solar year begins at the first equinox and divides into 12 months. The first (6) months are 31 days long and the next 5 months are of 30 days each. The last month of the year has 29 days in ordinary years and 30 days in leap years. The following table shows the names and duration of Iranian months and their correspondence to the months of the Gregorian calendar
| Months |
Number of days |
Beginning at |
Ending at |
| Farvardin |
31 |
March 21 |
April 20 |
| Ordibehesht |
31 |
April 21 |
May 21 |
| Khordad |
31 |
May 22 |
June 21 |
| Tir |
31 |
June 22 |
July 22 |
| Mordad |
31 |
July 23 |
August 22 |
| Shahrivar |
31 |
August 23 |
September 22 |
| Mehr |
30 |
September 23 |
October 22 |
| Aban |
30 |
October 23 |
November 21 |
| Azar |
30 |
November 22 |
December 21 |
| Day |
30 |
December 22 |
January 20 |
| Bahman |
30 |
January 21 |
February 19 |
| Esfand |
29* |
February 20 |
March 2O** |
* 30 days in Iranian leap years
** March 19 in Gregorian leap years
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