Well, the Hijri date 15 Shawwal 1504 corresponds to the Gregorian date Monday, 21 July 2081. This date lies in the tenth month of the Hijri year 1504 AH, which is Shawwal of 1504 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1504/10/15 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 21 July 2081 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Shawwal 1504 AH to its equivalent Gregorian date.
مَن كَانَ يَظُنُّ أَن لَّن يَنصُرَهُ ٱللَّهُ فِى ٱلدُّنْيَا وَٱلْءَاخِرَةِ فَلْيَمْدُدْ بِسَبَبٍ إِلَى ٱلسَّمَآءِ ثُمَّ لْيَقْطَعْ فَلْيَنظُرْ هَلْ يُذْهِبَنَّ كَيْدُهُۥ مَا يَغِيظُ
Whoso is wont to think (through envy) that Allah will not give him (Muhammad) victory in the world and the Hereafter (and is enraged at the thought of his victory), let him stretch a rope up to the roof (of his dwelling), and let him hang himself. Then let him see whether his strategy dispelleth that whereat he rageth!.
Surah Al-Hajj(22:15)