Well, the Hijri date 11 Rajab 1275 corresponds to the Gregorian date Sunday, 13 February 1859. This date lies in the seventh month of the Hijri year 1275 AH, which is Rajab of 1275 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1275/07/11 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 13 February 1859 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Rajab 1275 AH to its equivalent Gregorian date.
وَمَا مِن دَآبَّةٍۢ فِى ٱلْأَرْضِ وَلَا طَٰٓئِرٍۢ يَطِيرُ بِجَنَاحَيْهِ إِلَّآ أُمَمٌ أَمْثَالُكُم ۚ مَّا فَرَّطْنَا فِى ٱلْكِتَٰبِ مِن شَىْءٍۢ ۚ ثُمَّ إِلَىٰ رَبِّهِمْ يُحْشَرُونَ
There is not an animal in the earth, nor a flying creature flying on two wings, but they are peoples like unto you. We have neglected nothing in the Book (of Our decrees). Then unto their Lord they will be gathered.
Surah Al-An'aam(6:38)