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The Indian national calendar (sometimes called Saka calendar) is the official civil calendar in India. It is used by the Gazette of India, news broadcasts by All India Radio, and in calendars and communications issued by the Government of India.
| Month | Length | Start date (Gregorian) | |
| 1 | Chaitra | 30/31 | March 22* |
| 2 | Vaisakha | 31 | April 21 |
| 3 | Jyaistha | 31 | May 22 |
| 4 | Asadha | 31 | June 22 |
| 5 | Sravana | 31 | July 23 |
| 6 | Bhadra | 31 | August 23 |
| 7 | Asvina | 30 | September 23 |
| 8 | Kartika | 30 | October 23 |
| 9 | Margashirsh (Agrahayana) | 30 | November 22 |
| 10 | Pausa | 30 | December 22 |
| 11 | Magha | 30 | January 21 |
| 12 | Phalguna | 30 | February 20 |
The months in the first half of the year all have 31 days. This was done to take in account for the slower movement of the sun across the sky during that time.
In leap years, Chaitra has 31 days and starts on March 21.
Mohar of Gorkha king Prithvi Narayan Shah dated Saka Era 1685 (AD 1763)
