Well, the Hijri date 14 Dhul Qidah 1278 corresponds to the Gregorian date Monday, 12 May 1862. This date lies in the eleventh month of the Hijri year 1278 AH, which is Dhu Al-Qidah of 1278 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1278/11/14 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 May 1862 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Dhul Qidah 1278 AH to its equivalent Gregorian date.
۞ وَعِندَهُۥ مَفَاتِحُ ٱلْغَيْبِ لَا يَعْلَمُهَآ إِلَّا هُوَ ۚ وَيَعْلَمُ مَا فِى ٱلْبَرِّ وَٱلْبَحْرِ ۚ وَمَا تَسْقُطُ مِن وَرَقَةٍ إِلَّا يَعْلَمُهَا وَلَا حَبَّةٍۢ فِى ظُلُمَٰتِ ٱلْأَرْضِ وَلَا رَطْبٍۢ وَلَا يَابِسٍ إِلَّا فِى كِتَٰبٍۢ مُّبِينٍۢ
And with Him are the keys of the Invisible. None but He knoweth them. And He knoweth what is in the land and the sea. Not a leaf falleth but He knoweth it, not a grain amid the darkness of the earth, naught of wet or dry but (it is noted) in a clear record.
Surah Al-An'aam(6:59)