Well, the Hijri date 25 Shaban 1337 corresponds to the Gregorian date Sunday, 25 May 1919. This date lies in the eighth month of the Hijri year 1337 AH, which is Shaban of 1337 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1337/08/25 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 May 1919 to its equivalent Arabic date.
The following is the conversion of the Arabic date 25 Shaban 1337 AH to its equivalent Gregorian date.
وَيَعْبُدُونَ مِن دُونِ ٱللَّهِ مَا لَمْ يُنَزِّلْ بِهِۦ سُلْطَٰنًۭا وَمَا لَيْسَ لَهُم بِهِۦ عِلْمٌۭ ۗ وَمَا لِلظَّٰلِمِينَ مِن نَّصِيرٍۢ
And they worship instead of Allah that for which He hath sent down no warrant, and that whereof they have no knowledge. For evil-doers there is no helper.
Surah Al-Hajj(22:71)