Many Muslims lack knowledge about the Islamic Calendars and their calculations. This thread aims to provide a concise overview.

The Islamic calendar is founded on a lunar year comprising 12 complete lunar cycles, totaling 354 days. Consequently, each fresh Islamic year arrives approximately 10 to 11 days earlier than the 364-day solar calendar. The Islamic year comprises the following 12 months:

1. Muharram
2. Safar
3. Rabi’ al-Awwal (Rabi’ 1)
4. Rabi’ al-Thani (Rabi 2)
5. Jumada al-Ula (Jumada I)
6. Jumada al-Akhirah (Jumada II)
7. Rajab
8. Sha’ban
9. Ramadan
10. Shawwal
11. Dhu al-Qa’dah
12. Dhi al-Hijjah

Please let's memorize it!

The initial day of Year One in the Islamic calendar marks the commencement of the Hijrah, the Prophet's migration from Makkah to Madinah on July 26, 622 C.E. In Western notation, Islamic dates are designated by the abbreviation AH, derived from the Latin "Anno Hegirae," meaning 'Year of the Hijrah.'

CONVERSION

For an approximate conversion of an Islamic calendar year (AH) to a Gregorian equivalent (A.D./C.E.), or vice versa, you can use one of the following equations:

AD = 622 + (32/33 x AH)
AH = 33/32 x (AD – 622)