Well, the Hijri date 21 Rabi Al Awwal 1199 corresponds to the Gregorian date Monday, 31 January 1785. This date lies in the third month of the Hijri year 1199 AH, which is Rabi Al-Awwal of 1199 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1199/03/21 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 31 January 1785 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Awwal 1199 AH to its equivalent Gregorian date.
وَلَقَدْ ضَرَبْنَا لِلنَّاسِ فِى هَٰذَا ٱلْقُرْءَانِ مِن كُلِّ مَثَلٍۢ ۚ وَلَئِن جِئْتَهُم بِـَٔايَةٍۢ لَّيَقُولَنَّ ٱلَّذِينَ كَفَرُوٓا۟ إِنْ أَنتُمْ إِلَّا مُبْطِلُونَ
Verily We have coined for mankind in this Qur'an all kinds of similitudes; and indeed if thou camest unto them with a miracle, those who disbelieve would verily exclaim: Ye are but tricksters!
Surah Ar-Room(30:58)