Gregorian hijri calendar 2017 pdf article is about the lunar Hijri calendar. For the solar calendar whose first year is fixed to the Hijra, see Solar Hijri calendar. 12 months in a year of 354 or 355 days. It is also used by Muslims to determine the proper days of Islamic holidays and rituals, such as the annual period of fasting and the proper time for the pilgrimage to Mecca.
The Islamic calendar employs the Hijri era whose epoch was retrospectively established as the Islamic New Year of AD 622. The current Islamic year is 1439 AH. In the Gregorian calendar, 1439 AH runs from approximately 21 September 2017 to 10 September 2018. For Central Arabia, especially Mecca, there is a lack of epigraphical evidence but details are found in the writings of Muslim authors of the Abbasid era.