Well, the Hijri date 23 Shaban 1137 corresponds to the Gregorian date Sunday, 6 May 1725. This date lies in the eighth month of the Hijri year 1137 AH, which is Shaban of 1137 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1137/08/23 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 6 May 1725 to its equivalent Arabic date.
The following is the conversion of the Arabic date 23 Shaban 1137 AH to its equivalent Gregorian date.
وَقَالُوٓا۟ أَسَٰطِيرُ ٱلْأَوَّلِينَ ٱكْتَتَبَهَا فَهِىَ تُمْلَىٰ عَلَيْهِ بُكْرَةًۭ وَأَصِيلًۭا
And they say: Fables of the men of old which he hath had written down so that they are dictated to him morn and evening.
Surah Al-Furqaan(25:5)