Well, the Hijri date 24 Shawwal 1231 corresponds to the Gregorian date Monday, 16 September 1816. This date lies in the tenth month of the Hijri year 1231 AH, which is Shawwal of 1231 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1231/10/24 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 16 September 1816 to its equivalent Arabic date.
The following is the conversion of the Arabic date 24 Shawwal 1231 AH to its equivalent Gregorian date.
لَٰكِنِ ٱلَّذِينَ ٱتَّقَوْا۟ رَبَّهُمْ لَهُمْ غُرَفٌۭ مِّن فَوْقِهَا غُرَفٌۭ مَّبْنِيَّةٌۭ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَٰرُ ۖ وَعْدَ ٱللَّهِ ۖ لَا يُخْلِفُ ٱللَّهُ ٱلْمِيعَادَ
But those who keep their duty to their Lord, for them are lofty halls with lofty halls above them, built (for them), beneath which rivers flow. (It is) a promise of Allah. Allah faileth not His promise.
Surah Az-Zumar(39:20)