Well, the Hijri date 12 Rajab 1288 corresponds to the Gregorian date Tuesday, 26 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 Tuesday without any doubt. The Arabic date 1288/07/12 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 26 September 1871 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Rajab 1288 AH to its equivalent Gregorian date.
بَلْ قَالُوٓا۟ أَضْغَٰثُ أَحْلَٰمٍۭ بَلِ ٱفْتَرَىٰهُ بَلْ هُوَ شَاعِرٌۭ فَلْيَأْتِنَا بِـَٔايَةٍۢ كَمَآ أُرْسِلَ ٱلْأَوَّلُونَ
Nay, say they, (these are but) muddled dreams; nay, he hath but invented it; nay, he is but a poet. Let him bring us a portent even as those of old (who were Allah's messengers) were sent (with portents).
Surah Al-Anbiyaa(21:5)