Well, the Hijri date 20 Shaban 1321 corresponds to the Gregorian date Monday, 9 November 1903. This date lies in the eighth month of the Hijri year 1321 AH, which is Shaban of 1321 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1321/08/20 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 9 November 1903 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Shaban 1321 AH to its equivalent Gregorian date.
وَإِن يُكَذِّبُوكَ فَقَدْ كَذَّبَ ٱلَّذِينَ مِن قَبْلِهِمْ جَآءَتْهُمْ رُسُلُهُم بِٱلْبَيِّنَٰتِ وَبِٱلزُّبُرِ وَبِٱلْكِتَٰبِ ٱلْمُنِيرِ
And if they deny thee, those before them also denied. Their messengers came unto them with clear proofs (of Allah's Sovereignty), and with the Psalms and the Scripture giving light.
Surah Faatir(35:25)