Well, the Hijri date 12 Muharram 1206 corresponds to the Gregorian date Saturday, 10 September 1791. This date lies in the first month of the Hijri year 1206 AH, which is Muharram of 1206 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1206/01/12 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 10 September 1791 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Muharram 1206 AH to its equivalent Gregorian date.
وَأَمَّا مَنْ أُوتِىَ كِتَٰبَهُۥ بِشِمَالِهِۦ فَيَقُولُ يَٰلَيْتَنِى لَمْ أُوتَ كِتَٰبِيَهْ
But as for him who is given his record in his left hand, he will say: Oh, would that I had not been given my book
Surah Al-Haaqqa(69:25)