Well, the Hijri date 18 Muharram 1400 corresponds to the Gregorian date Friday, 7 December 1979. This date lies in the first month of the Hijri year 1400 AH, which is Muharram of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1400/01/18 is calculated using the Umm Al-Qura calendar and the sighting of the moon. One thing to remember is that this Arabic date may occur on different Gregorian date depending upon the region and country and obviously the moon.
If you are still not sure about the date then you can use our Arabic date converter.
The following is the conversion of the Gregorian date 7 December 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Muharram 1400 AH to its equivalent Gregorian date.
فَإِنِ ٱنتَهَوْا۟ فَإِنَّ ٱللَّهَ غَفُورٌۭ رَّحِيمٌۭ
But if they desist, then lo! Allah is Forgiving, Merciful.
Surah Al-Baqara(2:192)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah the Exalted: "So, glorify the praises of your Lord, and ask His forgiveness. Verily! He is the One Who accepts the repentance and forgives." (V.110:3)
Narrated Ibn `Abbas:
`Umar used to make me sit with the elderly men who had fought in the Battle of Badr. Some of them felt it (did not like that) and said to `Umar "Why do you bring in this boy to sit with us while we have sons like him?" `Umar replied, "Because of what you know of his position (i.e. his religious knowledge.)" One day `Umar called me and made me sit in the gathering of those people; and I think that he called me just to show them. (my religious knowledge). `Umar then asked them (in my presence). "What do you say about the interpretation of the Statement of Allah: 'When comes Help of Allah (to you O, Muhammad against your enemies) and the conquest (of Mecca).' (110.1) Some of them said, "We are ordered to praise Allah and ask for His forgiveness when Allah's Help and the conquest (of Mecca) comes to us." Some others kept quiet and did not say anything. On that, `Umar asked me, "Do you say the same, O Ibn `Abbas?" I replied, "No." He said, 'What do you say then?" I replied, "That is the sign of the death of Allah's Messenger (ﷺ) which Allah informed him of. Allah said:-- '(O Muhammad) When comes the Help of Allah (to you against your enemies) and the conquest (of Mecca) (which is the sign of your death). You should celebrate the praises of your Lord and ask for His Forgiveness, and He is the One Who accepts the repentance and forgives.' (110.3) On that `Umar said, "I do not know anything about it other than what you have said."
Sahih al-Bukhari 4970