Well, the Hijri date 21 Shaban 1288 corresponds to the Gregorian date Saturday, 4 November 1871. This date lies in the eighth month of the Hijri year 1288 AH, which is Shaban of 1288 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1288/08/21 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 4 November 1871 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Shaban 1288 AH to its equivalent Gregorian date.
فَخَسَفْنَا بِهِۦ وَبِدَارِهِ ٱلْأَرْضَ فَمَا كَانَ لَهُۥ مِن فِئَةٍۢ يَنصُرُونَهُۥ مِن دُونِ ٱللَّهِ وَمَا كَانَ مِنَ ٱلْمُنتَصِرِينَ
So We caused the earth to swallow him and his dwelling-place. Then he had no host to help him against Allah, nor was he of those who can save themselves.
Surah Al-Qasas(28:81)