Well, the Hijri date 15 Shaban 1238 corresponds to the Gregorian date Saturday, 26 April 1823. This date lies in the eighth month of the Hijri year 1238 AH, which is Shaban of 1238 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1238/08/15 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 26 April 1823 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Shaban 1238 AH to its equivalent Gregorian date.
وَإِن مَّا نُرِيَنَّكَ بَعْضَ ٱلَّذِى نَعِدُهُمْ أَوْ نَتَوَفَّيَنَّكَ فَإِنَّمَا عَلَيْكَ ٱلْبَلَٰغُ وَعَلَيْنَا ٱلْحِسَابُ
Whether We let thee see something of that which We have promised them, or make thee die (before its happening), thine is but conveyance (of the message). Ours the reckoning.
Surah Ar-Ra'd(13:40)