Well, the Hijri date 15 Rabi Al Thani 1280 corresponds to the Gregorian date Monday, 28 September 1863. This date lies in the fourth month of the Hijri year 1280 AH, which is Rabi Al-Thani of 1280 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1280/04/15 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 28 September 1863 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Rabi Al Thani 1280 AH to its equivalent Gregorian date.
مَا كَانَ لِنَبِىٍّ أَن يَكُونَ لَهُۥٓ أَسْرَىٰ حَتَّىٰ يُثْخِنَ فِى ٱلْأَرْضِ ۚ تُرِيدُونَ عَرَضَ ٱلدُّنْيَا وَٱللَّهُ يُرِيدُ ٱلْءَاخِرَةَ ۗ وَٱللَّهُ عَزِيزٌ حَكِيمٌۭ
It is not for any prophet to have captives until he hath made slaughter in the land. Ye desire the lure of this world and Allah desireth (for you) the Hereafter, and Allah is Mighty, Wise.
Surah Al-Anfaal(8:67)