Well, the Hijri date 30 Rajab 1231 corresponds to the Gregorian date Tuesday, 25 June 1816. This date lies in the seventh month of the Hijri year 1231 AH, which is Rajab of 1231 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1231/07/30 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 25 June 1816 to its equivalent Arabic date.
The following is the conversion of the Arabic date 30 Rajab 1231 AH to its equivalent Gregorian date.
مَا ٱتَّخَذَ ٱللَّهُ مِن وَلَدٍۢ وَمَا كَانَ مَعَهُۥ مِنْ إِلَٰهٍ ۚ إِذًۭا لَّذَهَبَ كُلُّ إِلَٰهٍۭ بِمَا خَلَقَ وَلَعَلَا بَعْضُهُمْ عَلَىٰ بَعْضٍۢ ۚ سُبْحَٰنَ ٱللَّهِ عَمَّا يَصِفُونَ
Allah hath not chosen any son, nor is there any god along with Him; else would each god have assuredly championed that which he created, and some of them would assuredly have overcome others. Glorified be Allah above all that they allege.
Surah Al-Muminoon(23:91)