Well, the Hijri date 21 Ramadan 1288 corresponds to the Gregorian date Sunday, 3 December 1871. This date lies in the ninth month of the Hijri year 1288 AH, which is Ramadan of 1288 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1288/09/21 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 3 December 1871 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Ramadan 1288 AH to its equivalent Gregorian date.
وَسَخَّرَ لَكُمُ ٱلَّيْلَ وَٱلنَّهَارَ وَٱلشَّمْسَ وَٱلْقَمَرَ ۖ وَٱلنُّجُومُ مُسَخَّرَٰتٌۢ بِأَمْرِهِۦٓ ۗ إِنَّ فِى ذَٰلِكَ لَءَايَٰتٍۢ لِّقَوْمٍۢ يَعْقِلُونَ
And He hath constrained the night and the day and the sun and the moon to be of service unto you, and the stars are made subservient by His command. Lo! herein indeed are portents for people who have sense.
Surah An-Nahl(16:12)