The Islamic or "Hijri" calendar is a lunar calendar, whose months begin and end depending on the movements of the moon. The moon’s disappearance signals the sign of the end of the month. The Hijri calendar was officially created during the reign of Khalifa Umar ibn al-Khattab.
The Prophet's migration or hijra in 622AD marks the beginning of the Hijri year calendar and gives the calendar its name.
The “Hijri” calendar is used to mark a number of significant Islamic events and dates like Ramadan, Eid al-Fitr, Eid al-Adha and the beginning of the Hajj season. The Hijri year consists of 12 months: Muharram, Safar, Rabi 'Al-Awal, Rabee' Al-Akhir, Jumada Al Ula, Jumada Al-Akhirah, Rajab, Shaaban, Ramadan, Shawwal, Dhu Al Qa’da and Dhu Al Hijja.
The Hijri Year refers to our Prophet Muhammad (peace be upon him)’s migration (Hijira) from the city of Makkah to the city of Al Madina El Monawara in 622AD.
The Story of Hijri Calendar
Before the Hijri calendar came into use, Muslims used a range of important events in Muslim history, for example, Am Al-Fil, the year in which the Prophet Muhammad was born, to demarcate time. But, seventeen years after the Prophet’s migration and in the third or fourth year of the succession of Khalifa Umar ibn al-Khattab, a complaint was made by Abu Musa al-Ash'ari, an official in Basrah (Iraq), regarding a lack of consistent dates on the correspondence he received. Abu Musa al-Ash'ari sent a letter to Khalifa Umar, asking him to develop for a new way to calculate dates.
Khalifa Umar debated the issue with his advisors. Some suggested that the date of the Prophet’s birth should mark the beginning of a new calendar, whilst others suggested the date of his death. However, the majority agreed that the calendar should begin with the date of his migration. Khalifa Umar then consulted the Prophet’s revered companions, Uthman ibn Affan and Ali bin Abi Talib, and they agreed.
After all the discussions, Khalifa Umar announced that the year in which the Prophet Mohammad migrated would mark the beginning of the Hijri calendar. The calendar would begin with the first of the month of Muharram and end with the month of Dhu Al Hijja. Consequently, 622 AD (the year of the Prophet’s migration) became the first year in the Hijiri calendar.
The Hijri year consists of 12 months. As Allah says in the Quran in verse 36 of Surat al-Tawbah:
“Verily the number of months with Allah is twelve months in the Book of Allah, (since) the day He created the heavens and the earth, four of them are sacred. That is the established religion. So be you not unjust unto your selves during them."
Each Hijri month starts at the beginning of the new moon cycle. The number of days in each Hijri calendar month varies according to the moon’s progress around the earth. The length of each month is 29 to 30 days.
Why is the Islamic calendar important?
The Islamic calendar is not only important for us to commemorate significant Islamic events, but the fact that it starts from the Hijra (Migration) serves as an important reminder of the sacrifice for the cause of truth and for the preservation of the Revelation. As the Muslims sacrificed everything, from their wealth to familial ties, to migrate from Makkah to Madinah to preserve their religion.
Through the Hijri calendar, Allah (swt) teaches us that the struggle between truth and evil is eternal. As Muslims, we are constantly fighting this battle as we sacrifice our pleasures and desires for the path to righteousness and Jannah.
As Muslims, we should welcome the new Islamic year with self-reflection and resolution to draw closer to Allah (swt).


