Well, the Hijri date 17 Rabi Al Thani 1191 corresponds to the Gregorian date Saturday, 24 May 1777. This date lies in the fourth month of the Hijri year 1191 AH, which is Rabi Al-Thani of 1191 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1191/04/17 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 24 May 1777 to its equivalent Arabic date.
The following is the conversion of the Arabic date 17 Rabi Al Thani 1191 AH to its equivalent Gregorian date.
وَأَنْ أَتْلُوَا۟ ٱلْقُرْءَانَ ۖ فَمَنِ ٱهْتَدَىٰ فَإِنَّمَا يَهْتَدِى لِنَفْسِهِۦ ۖ وَمَن ضَلَّ فَقُلْ إِنَّمَآ أَنَا۠ مِنَ ٱلْمُنذِرِينَ
And to recite the Qur'an. And whoso goeth right, goeth right only for (the good of) his own soul; and as for him who goeth astray - (Unto him) say: Lo! I am only a warner.
Surah An-Naml(27:92)