Well, the Hijri date 18 Ramadan 1235 corresponds to the Gregorian date Wednesday, 28 June 1820. This date lies in the ninth month of the Hijri year 1235 AH, which is Ramadan of 1235 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1235/09/18 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 28 June 1820 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Ramadan 1235 AH to its equivalent Gregorian date.
وَقَالُوا۟ لَوْ شَآءَ ٱلرَّحْمَٰنُ مَا عَبَدْنَٰهُم ۗ مَّا لَهُم بِذَٰلِكَ مِنْ عِلْمٍ ۖ إِنْ هُمْ إِلَّا يَخْرُصُونَ
And they say: If the Beneficent One had (so) willed, we should not have worshipped them. They have no knowledge whatsoever of that. They do but guess.
Surah Az-Zukhruf(43:20)