Well, the Hijri date 21 Rabi Al Thani 1418 corresponds to the Gregorian date Sunday, 24 August 1997. This date lies in the fourth month of the Hijri year 1418 AH, which is Rabi Al-Thani of 1418 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1418/04/21 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 24 August 1997 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1418 AH to its equivalent Gregorian date.
قَالُوٓا۟ أَرْجِهْ وَأَخَاهُ وَٱبْعَثْ فِى ٱلْمَدَآئِنِ حَٰشِرِينَ
They said: Put him off, (him) and his brother, and send into the cities summoners
Surah Ash-Shu'araa(26:36)