Well, the Hijri date 9 Rabi Al Thani 1278 corresponds to the Gregorian date Sunday, 13 October 1861. This date lies in the fourth month of the Hijri year 1278 AH, which is Rabi Al-Thani of 1278 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1278/04/09 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 13 October 1861 to its equivalent Arabic date.
The following is the conversion of the Arabic date 9 Rabi Al Thani 1278 AH to its equivalent Gregorian date.
فَأَثَٰبَهُمُ ٱللَّهُ بِمَا قَالُوا۟ جَنَّٰتٍۢ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَٰرُ خَٰلِدِينَ فِيهَا ۚ وَذَٰلِكَ جَزَآءُ ٱلْمُحْسِنِينَ
Allah hath rewarded them for that their saying - Gardens underneath which rivers flow, wherein they will abide for ever. That is the reward of the good.
Surah Al-Maaida(5:85)