Well, the Hijri date 11 Rajab 1256 corresponds to the Gregorian date Monday, 7 September 1840. This date lies in the seventh month of the Hijri year 1256 AH, which is Rajab of 1256 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1256/07/11 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 7 September 1840 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Rajab 1256 AH to its equivalent Gregorian date.
وَقَالَ ٱلَّذِينَ أُوتُوا۟ ٱلْعِلْمَ وَٱلْإِيمَٰنَ لَقَدْ لَبِثْتُمْ فِى كِتَٰبِ ٱللَّهِ إِلَىٰ يَوْمِ ٱلْبَعْثِ ۖ فَهَٰذَا يَوْمُ ٱلْبَعْثِ وَلَٰكِنَّكُمْ كُنتُمْ لَا تَعْلَمُونَ
But those to whom knowledge and faith are given will say: The truth is, ye have tarried, by Allah's decree, until the Day of Resurrection. This is the Day of Resurrection, but ye used not to know.
Surah Ar-Room(30:56)