Well, the Hijri date 15 Shawwal 1287 corresponds to the Gregorian date Saturday, 7 January 1871. This date lies in the tenth month of the Hijri year 1287 AH, which is Shawwal of 1287 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1287/10/15 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 7 January 1871 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Shawwal 1287 AH to its equivalent Gregorian date.
وَلَقَدْ صَدَّقَ عَلَيْهِمْ إِبْلِيسُ ظَنَّهُۥ فَٱتَّبَعُوهُ إِلَّا فَرِيقًۭا مِّنَ ٱلْمُؤْمِنِينَ
And Satan indeed found his calculation true concerning them, for they follow him, all save a group of true believers.
Surah Saba(34:20)