Fasli calendar or Fasli era (Fasli; Urdu: فصلی, Arabic: فصلى; lit. 'Harvest') is a harvest-based calendar system that was used across South Asia, but today is mainly used in Deccan.^[1] It was the official calendar of Hyderabad Deccan.

The Deccani Fasli calendar begins in October, marking the first of Azur.

Fasli year means the period of 12 months from July to June. Adding 590 to Fasli year comes to Gregorian calendar, corresponding Gregorian year for Fasli year 1410 was from July 2000-June 2001.^[2]

The calendar formation year is considered as 963 Hijra (A. H.) in the Islamic calendar. From that year onward, the Fasli calendar has been a solar year. The name and number of the Days and the Months are the same as Islamic calendar. The first day of the year is 7 or 8 June.^[3]

The Fasli calendar dated from the accession year of Akbar. Thus the beginning of the Fasli era is equal to below calendars.^[1]

• 963 AH (Islamic calendar)
• 1556 AD (Julian calendar)
• 1612 SE (Hindu Samavat Calendar)

Fasli Calendar is a chronological system introduced by the Mughal emperor Akbar basically for land revenue and records purposes in northern India, The differences in records dates due to the Muslim lunar calendar because of moon sighting have led him to introduce an alternate calendar which follows simultaneously with Islamic Lunar calendar and Hindu Samavat solar Calendar. Which can give the fixed dating system.^[1]

Akbar insistence to equalize the Fasli calendar according to Islamic calendar accordingly with Hindu calendar, thus he took 649 years from the Hindu calendar year to make the Fasli year 963. Since then, the Fasli calendar proceeded according to the Hindu calendar.^{[citation needed]}

Shah Jahan the grandson of Akbar, introduced the Fasli Calendar to Deccan Suba (South India) in 1630 AD,^[4] which continued as an official calendar of Asaf Jahi rulers of the Hyderabad State, until last Nizam, Mir Osman Ali Khan acceded the Hyderabad State to the Indian Union.^{[citation needed]}

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After the accession of the Hyderabad State, the Nizam continued as the Rajpramukh (princely Head of State) and used to follow the Fasli calendar in his official sanctions and records. Currently Andhra Pradesh State Wakf Board, Nizam Trust follows the Fasli calendar simultaneously with Gregorian calendar and Islamic calendar to maintain records.^{[citation needed]} The Andhra Pradesh Government, Karnataka Government and the Tamil Nadu Government still use Fasli year in all of their revenue and judiciary purposes.^{[2][5][better source needed]}

• Faṣlī era – Encyclopædia Britannica