Well, the Hijri date 15 Ramadan 1185 corresponds to the Gregorian date Saturday, 21 December 1771. This date lies in the ninth month of the Hijri year 1185 AH, which is Ramadan of 1185 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1185/09/15 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 21 December 1771 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Ramadan 1185 AH to its equivalent Gregorian date.
مَا تَعْبُدُونَ مِن دُونِهِۦٓ إِلَّآ أَسْمَآءًۭ سَمَّيْتُمُوهَآ أَنتُمْ وَءَابَآؤُكُم مَّآ أَنزَلَ ٱللَّهُ بِهَا مِن سُلْطَٰنٍ ۚ إِنِ ٱلْحُكْمُ إِلَّا لِلَّهِ ۚ أَمَرَ أَلَّا تَعْبُدُوٓا۟ إِلَّآ إِيَّاهُ ۚ ذَٰلِكَ ٱلدِّينُ ٱلْقَيِّمُ وَلَٰكِنَّ أَكْثَرَ ٱلنَّاسِ لَا يَعْلَمُونَ
Those whom ye worship beside Him are but names which ye have named, ye and your fathers. Allah hath revealed no sanction for them. The decision rests with Allah only, Who hath commanded you that ye worship none save Him. This is the right religion, but most men know not.
Surah Yusuf(12:40)