Well, the Hijri date 9 Dhul Qidah 1231 corresponds to the Gregorian date Monday, 30 September 1816. This date lies in the eleventh month of the Hijri year 1231 AH, which is Dhu Al-Qidah of 1231 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1231/11/09 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 30 September 1816 to its equivalent Arabic date.
The following is the conversion of the Arabic date 9 Dhul Qidah 1231 AH to its equivalent Gregorian date.
وَقَالَ ٱلْمَلَأُ ٱلَّذِينَ كَفَرُوا۟ مِن قَوْمِهِۦ لَئِنِ ٱتَّبَعْتُمْ شُعَيْبًا إِنَّكُمْ إِذًۭا لَّخَٰسِرُونَ
But the chieftains of his people, who were disbelieving, said: If ye follow Shu'eyb, then truly ye shall be the losers.
Surah Al-A'raaf(7:90)