Well, the Hijri date 11 Shaban 1228 corresponds to the Gregorian date Sunday, 8 August 1813. This date lies in the eighth month of the Hijri year 1228 AH, which is Shaban of 1228 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1228/08/11 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 8 August 1813 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Shaban 1228 AH to its equivalent Gregorian date.
وَإِذَا يُتْلَىٰ عَلَيْهِمْ قَالُوٓا۟ ءَامَنَّا بِهِۦٓ إِنَّهُ ٱلْحَقُّ مِن رَّبِّنَآ إِنَّا كُنَّا مِن قَبْلِهِۦ مُسْلِمِينَ
And when it is recited unto them, they say: We believe in it. Lo! it is the Truth from our Lord. Lo! even before it we were of those who surrender (unto Him).
Surah Al-Qasas(28:53)