Well, the Hijri date 26 Shaban 1279 corresponds to the Gregorian date Sunday, 15 February 1863. This date lies in the eighth month of the Hijri year 1279 AH, which is Shaban of 1279 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1279/08/26 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 15 February 1863 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Shaban 1279 AH to its equivalent Gregorian date.
ذَٰلِكَ بِأَنَّهُمُ ٱسْتَحَبُّوا۟ ٱلْحَيَوٰةَ ٱلدُّنْيَا عَلَى ٱلْءَاخِرَةِ وَأَنَّ ٱللَّهَ لَا يَهْدِى ٱلْقَوْمَ ٱلْكَٰفِرِينَ
That is because they have chosen the life of the world rather than the Hereafter, and because Allah guideth not the disbelieving folk.
Surah An-Nahl(16:107)