Well, the Hijri date 21 Shaban 1423 corresponds to the Gregorian date Sunday, 27 October 2002. This date lies in the eighth month of the Hijri year 1423 AH, which is Shaban of 1423 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1423/08/21 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 27 October 2002 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Shaban 1423 AH to its equivalent Gregorian date.
لِّيَعْلَمَ أَن قَدْ أَبْلَغُوا۟ رِسَٰلَٰتِ رَبِّهِمْ وَأَحَاطَ بِمَا لَدَيْهِمْ وَأَحْصَىٰ كُلَّ شَىْءٍ عَدَدًۢا
That He may know that they have indeed conveyed the messages of their Lord. He surroundeth all their doings, and He keepeth count of all things.
Surah Al-Jinn(72:28)