Well, the Hijri date 20 Shaban 1491 corresponds to the Gregorian date Wednesday, 17 October 2068. This date lies in the eighth month of the Hijri year 1491 AH, which is Shaban of 1491 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1491/08/20 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 17 October 2068 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Shaban 1491 AH to its equivalent Gregorian date.
فَلَنَسْـَٔلَنَّ ٱلَّذِينَ أُرْسِلَ إِلَيْهِمْ وَلَنَسْـَٔلَنَّ ٱلْمُرْسَلِينَ
Then verily We shall question those unto whom (Our message) hath been sent, and verily We shall question the messengers.
Surah Al-A'raaf(7:6)