Well, the Hijri date 13 Muharram 1278 corresponds to the Gregorian date Saturday, 20 July 1861. This date lies in the first month of the Hijri year 1278 AH, which is Muharram of 1278 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1278/01/13 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 20 July 1861 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Muharram 1278 AH to its equivalent Gregorian date.
ثُمَّ بَعَثْنَا مِنۢ بَعْدِهِم مُّوسَىٰ وَهَٰرُونَ إِلَىٰ فِرْعَوْنَ وَمَلَإِي۟هِۦ بِـَٔايَٰتِنَا فَٱسْتَكْبَرُوا۟ وَكَانُوا۟ قَوْمًۭا مُّجْرِمِينَ
Then, after them, We sent Moses and Aaron unto Pharaoh and his chiefs with Our revelations, but they were arrogant and were a guilty folk.
Surah Yunus(10:75)