Well, the Hijri date 20 Rabi Al Awwal 1231 corresponds to the Gregorian date Sunday, 18 February 1816. This date lies in the third month of the Hijri year 1231 AH, which is Rabi Al-Awwal of 1231 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1231/03/20 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 18 February 1816 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rabi Al Awwal 1231 AH to its equivalent Gregorian date.
وَلَا تَقْتُلُوا۟ ٱلنَّفْسَ ٱلَّتِى حَرَّمَ ٱللَّهُ إِلَّا بِٱلْحَقِّ ۗ وَمَن قُتِلَ مَظْلُومًۭا فَقَدْ جَعَلْنَا لِوَلِيِّهِۦ سُلْطَٰنًۭا فَلَا يُسْرِف فِّى ٱلْقَتْلِ ۖ إِنَّهُۥ كَانَ مَنصُورًۭا
And slay not the life which Allah hath forbidden save with right. Whoso is slain wrongfully, We have given power unto his heir, but let him not commit excess in slaying. Lo! he will be helped.
Surah Al-Israa(17:33)