Although, the Islamic calendar was introduced in the Christian Era of 632 AD by the Messenger Muhammad (peace be upon him), the beginning of the Islamic era for the count of Islamic years was considered and discussed during 639 AD, the time of the 4th year of the Caliphate of Umar(R.A.) ….
Mughaira bin Shoba(R.A.) reports that in the lifetime of Rasulullah(sallallahu aliyhi wasallam)the sun eclipsed on the day on which (his son) Ibraheem died, so people said that the eclipse had occurred because of the death of Ibraheem.Rasulullah(sallallahu aliyhi wasallam) upon it, observed………..
The month of Zul-Hijjah is indeed a month of tremendous virtues and blessings. The First Ten Days of this month are especially significant and are among the most magnificent days in the Islamic calendar. It is reported from Ibn Abbaas(radhiyallahu anhu) that Rasulullah(sallallahu alaiyhi wassallam) said: ” There is no day wherein any good action is more beloved to Allah Ta’ala than these ten days (the first ten days of Zul Hijjah)”.
The Battle of Al-Badr
Day of Judgement. Belief in the Hereafter