Well, the Hijri date 18 Dhul Qidah 1231 corresponds to the Gregorian date Wednesday, 9 October 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 Wednesday without any doubt. The Arabic date 1231/11/18 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 9 October 1816 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Dhul Qidah 1231 AH to its equivalent Gregorian date.
وَمَا لَكُمْ لَا تُؤْمِنُونَ بِٱللَّهِ ۙ وَٱلرَّسُولُ يَدْعُوكُمْ لِتُؤْمِنُوا۟ بِرَبِّكُمْ وَقَدْ أَخَذَ مِيثَٰقَكُمْ إِن كُنتُم مُّؤْمِنِينَ
What aileth you that ye believe not in Allah, when the messenger calleth you to believe in your Lord, and He hath already made a covenant with you, if ye are believers?
Surah Al-Hadid(57:8)