Well, the Hijri date 14 Rabi Al Awwal 1231 corresponds to the Gregorian date Monday, 12 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 Monday without any doubt. The Arabic date 1231/03/14 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 12 February 1816 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Rabi Al Awwal 1231 AH to its equivalent Gregorian date.
وَإِمَّا تُعْرِضَنَّ عَنْهُمُ ٱبْتِغَآءَ رَحْمَةٍۢ مِّن رَّبِّكَ تَرْجُوهَا فَقُل لَّهُمْ قَوْلًۭا مَّيْسُورًۭا
But if thou turn away from them, seeking mercy from thy Lord, for which thou hopest, then speak unto them a reasonable word.
Surah Al-Israa(17:28)