इस्लामी क्यालेन्डरको केही महत्त्वपूर्ण तिथिहरु छन्:
* १ मुहरम([[Islamic New Year]])
* १० मुहरम([[Day of Ashurah]]) Anniversary of Moses and the Children of Israel crossing the red sea. Also the date of the martyrdom of [[Husayn ibn Ali]] and his followers.)
* १२ Rabiul Awal ([[Milad un Nabi]] for Sunni Muslims)
* १७ Rabiul Awal (Milad un Nabi for Isna Ashari Shia Muslims [[Twelvers]])
* १३ Rajab (Birthday of [[Ali ibn Abi Talib]].)
* २७ Rajab ([[Isra and Miraj]])
* १ Ramadan (first day of fasting)
* २१ Ramadan ([[Ali ibn Abi Talib]]'s death date. He was Muhammad's cousin and son in law and the father of [[Husayn ibn Ali]])
* २७ Ramadan (Nuzul Al-Qur'an) (१७ Ramadan in [[Malaysia]])
* Last third of Ramadan which includes [[Laylat al-Qadr]]
