Well, the Hijri date 26 Muharram 1280 corresponds to the Gregorian date Sunday, 12 July 1863. This date lies in the first month of the Hijri year 1280 AH, which is Muharram of 1280 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1280/01/26 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 12 July 1863 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Muharram 1280 AH to its equivalent Gregorian date.
قُل لَّا يَعْلَمُ مَن فِى ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ ٱلْغَيْبَ إِلَّا ٱللَّهُ ۚ وَمَا يَشْعُرُونَ أَيَّانَ يُبْعَثُونَ
Say (O Muhammad): None in the heavens and the earth knoweth the Unseen save Allah; and they know not when they will be raised (again).
Surah An-Naml(27:65)