Well, the Hijri date 18 Shaban 1231 corresponds to the Gregorian date Saturday, 13 July 1816. This date lies in the eighth month of the Hijri year 1231 AH, which is Shaban of 1231 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1231/08/18 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 13 July 1816 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Shaban 1231 AH to its equivalent Gregorian date.
أَلَمْ تَرَ إِلَى ٱلْمَلَإِ مِنۢ بَنِىٓ إِسْرَٰٓءِيلَ مِنۢ بَعْدِ مُوسَىٰٓ إِذْ قَالُوا۟ لِنَبِىٍّۢ لَّهُمُ ٱبْعَثْ لَنَا مَلِكًۭا نُّقَٰتِلْ فِى سَبِيلِ ٱللَّهِ ۖ قَالَ هَلْ عَسَيْتُمْ إِن كُتِبَ عَلَيْكُمُ ٱلْقِتَالُ أَلَّا تُقَٰتِلُوا۟ ۖ قَالُوا۟ وَمَا لَنَآ أَلَّا نُقَٰتِلَ فِى سَبِيلِ ٱللَّهِ وَقَدْ أُخْرِجْنَا مِن دِيَٰرِنَا وَأَبْنَآئِنَا ۖ فَلَمَّا كُتِبَ عَلَيْهِمُ ٱلْقِتَالُ تَوَلَّوْا۟ إِلَّا قَلِيلًۭا مِّنْهُمْ ۗ وَٱللَّهُ عَلِيمٌۢ بِٱلظَّٰلِمِينَ
Bethink thee of the leaders of the Children of Israel after Moses, how they said unto a prophet whom they had: Set up for us a king and we will fight in Allah's way. He said: Would ye then refrain from fighting if fighting were prescribed for you? They said: Why should we not fight in Allah's way when we have been driven from our dwellings with our children? Yet, when fighting was prescribed for them, they turned away, all save a few of them. Allah is aware of evil-doers.
Surah Al-Baqara(2:246)