Well, the Hijri date 18 Safar 1172 corresponds to the Gregorian date Friday, 20 October 1758. This date lies in the second month of the Hijri year 1172 AH, which is Safar of 1172 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1172/02/18 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 20 October 1758 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Safar 1172 AH to its equivalent Gregorian date.
فَجَعَلْنَا عَٰلِيَهَا سَافِلَهَا وَأَمْطَرْنَا عَلَيْهِمْ حِجَارَةًۭ مِّن سِجِّيلٍ
And We utterly confounded them, and We rained upon them stones of heated clay.
Surah Al-Hijr(15:74)