Well, the Hijri date 20 Muharram 1240 corresponds to the Gregorian date Monday, 13 September 1824. This date lies in the first month of the Hijri year 1240 AH, which is Muharram of 1240 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1240/01/20 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 13 September 1824 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Muharram 1240 AH to its equivalent Gregorian date.
إِن كَادَ لَيُضِلُّنَا عَنْ ءَالِهَتِنَا لَوْلَآ أَن صَبَرْنَا عَلَيْهَا ۚ وَسَوْفَ يَعْلَمُونَ حِينَ يَرَوْنَ ٱلْعَذَابَ مَنْ أَضَلُّ سَبِيلًا
He would have led us far away from our gods if we had not been staunch to them. They will know, when they behold the doom, who is more astray as to the road.
Surah Al-Furqaan(25:42)