Well, the Hijri date 21 Rabi Al Thani 1287 corresponds to the Gregorian date Wednesday, 20 July 1870. This date lies in the fourth month of the Hijri year 1287 AH, which is Rabi Al-Thani of 1287 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1287/04/21 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 20 July 1870 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1287 AH to its equivalent Gregorian date.
وَأَنِ ٱعْبُدُونِى ۚ هَٰذَا صِرَٰطٌۭ مُّسْتَقِيمٌۭ
But that ye worship Me? That was the right path.
Surah Yaseen(36:61)