Well, the Hijri date 21 Dhul Hijjah 1399 corresponds to the Gregorian date Sunday, 11 November 1979. This date lies in the twelfth month of the Hijri year 1399 AH, which is Dhu Al-Hijjah of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1399/12/21 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 11 November 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Dhul Hijjah 1399 AH to its equivalent Gregorian date.
قَالَ رَبِّ إِنِّىٓ أَخَافُ أَن يُكَذِّبُونِ
He said: My Lord! Lo! I fear that they will deny me,
Surah Ash-Shu'araa(26:12)
Sahih al-Bukhari
Virtues of the Qur'an
Chapter: The Qurra from among the Companions of the Prophet (saws)
Narrated Qatada:
I asked Anas bin Malik: "Who collected the Qur'an at the time of the Prophet (ﷺ) ?" He replied, "Four, all of whom were from the Ansar: Ubai bin Ka`b, Mu`adh bin Jabal, Zaid bin Thabit and Abu Zaid."
Sahih al-Bukhari 5003