Well, the Hijri date 11 Rajab 1270 corresponds to the Gregorian date Saturday, 8 April 1854. This date lies in the seventh month of the Hijri year 1270 AH, which is Rajab of 1270 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1270/07/11 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 8 April 1854 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Rajab 1270 AH to its equivalent Gregorian date.
يَٰٓأَهْلَ ٱلْكِتَٰبِ قَدْ جَآءَكُمْ رَسُولُنَا يُبَيِّنُ لَكُمْ عَلَىٰ فَتْرَةٍۢ مِّنَ ٱلرُّسُلِ أَن تَقُولُوا۟ مَا جَآءَنَا مِنۢ بَشِيرٍۢ وَلَا نَذِيرٍۢ ۖ فَقَدْ جَآءَكُم بَشِيرٌۭ وَنَذِيرٌۭ ۗ وَٱللَّهُ عَلَىٰ كُلِّ شَىْءٍۢ قَدِيرٌۭ
O People of the Scripture! Now hath Our messenger come unto you to make things plain unto you after an interval (of cessation) of the messengers, lest ye should say: There came not unto us a messenger of cheer nor any warner. Now hath a messenger of cheer and a warner come unto you. Allah is Able to do all things.
Surah Al-Maaida(5:19)