Well, the Hijri date 21 Rabi Al Thani 1317 corresponds to the Gregorian date Monday, 28 August 1899. This date lies in the fourth month of the Hijri year 1317 AH, which is Rabi Al-Thani of 1317 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1317/04/21 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 28 August 1899 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1317 AH to its equivalent Gregorian date.
ٱلَّذِينَ ءَامَنُوا۟ يُقَٰتِلُونَ فِى سَبِيلِ ٱللَّهِ ۖ وَٱلَّذِينَ كَفَرُوا۟ يُقَٰتِلُونَ فِى سَبِيلِ ٱلطَّٰغُوتِ فَقَٰتِلُوٓا۟ أَوْلِيَآءَ ٱلشَّيْطَٰنِ ۖ إِنَّ كَيْدَ ٱلشَّيْطَٰنِ كَانَ ضَعِيفًا
Those who believe do battle for the cause of Allah; and those who disbelieve do battle for the cause of idols. So fight the minions of the devil. Lo! the devil's strategy is ever weak.
Surah An-Nisaa(4:76)