Well, the Hijri date 11 Rajab 1288 corresponds to the Gregorian date Monday, 25 September 1871. This date lies in the seventh month of the Hijri year 1288 AH, which is Rajab of 1288 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1288/07/11 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 25 September 1871 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Rajab 1288 AH to its equivalent Gregorian date.
قَالَ ٱلْمَلَأُ ٱلَّذِينَ ٱسْتَكْبَرُوا۟ مِن قَوْمِهِۦ لِلَّذِينَ ٱسْتُضْعِفُوا۟ لِمَنْ ءَامَنَ مِنْهُمْ أَتَعْلَمُونَ أَنَّ صَٰلِحًۭا مُّرْسَلٌۭ مِّن رَّبِّهِۦ ۚ قَالُوٓا۟ إِنَّا بِمَآ أُرْسِلَ بِهِۦ مُؤْمِنُونَ
The chieftains of his people, who were scornful, said unto those whom they despised, unto such of them as believed: Know ye that Salih is one sent from his Lord? They said: Lo! In that wherewith he hath been sent we are believers.
Surah Al-A'raaf(7:75)