Well, the Hijri date 12 Dhul Qidah 1191 corresponds to the Gregorian date Thursday, 11 December 1777. This date lies in the eleventh month of the Hijri year 1191 AH, which is Dhu Al-Qidah of 1191 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1191/11/12 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 11 December 1777 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Dhul Qidah 1191 AH to its equivalent Gregorian date.
فَلَا تَحْسَبَنَّ ٱللَّهَ مُخْلِفَ وَعْدِهِۦ رُسُلَهُۥٓ ۗ إِنَّ ٱللَّهَ عَزِيزٌۭ ذُو ٱنتِقَامٍۢ
So think not that Allah will fail to keep His promise to His messengers. Lo! Allah is Mighty, Able to Requite (the wrong).
Surah Ibrahim(14:47)