Well, the Hijri date 11 Shaban 1266 corresponds to the Gregorian date Friday, 21 June 1850. This date lies in the eighth month of the Hijri year 1266 AH, which is Shaban of 1266 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1266/08/11 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 21 June 1850 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Shaban 1266 AH to its equivalent Gregorian date.
قَالَ سَـَٔاوِىٓ إِلَىٰ جَبَلٍۢ يَعْصِمُنِى مِنَ ٱلْمَآءِ ۚ قَالَ لَا عَاصِمَ ٱلْيَوْمَ مِنْ أَمْرِ ٱللَّهِ إِلَّا مَن رَّحِمَ ۚ وَحَالَ بَيْنَهُمَا ٱلْمَوْجُ فَكَانَ مِنَ ٱلْمُغْرَقِينَ
He said: I shall betake me to some mountain that will save me from the water. (Noah) said: This day there is none that saveth from the commandment of Allah save him on whom He hath had mercy. And the wave came in between them, so he was among the drowned.
Surah Hud(11:43)