Well, the Hijri date 21 Rabi Al Thani 1278 corresponds to the Gregorian date Friday, 25 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 Friday without any doubt. The Arabic date 1278/04/21 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 25 October 1861 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1278 AH to its equivalent Gregorian date.
وَإِذَا فَعَلُوا۟ فَٰحِشَةًۭ قَالُوا۟ وَجَدْنَا عَلَيْهَآ ءَابَآءَنَا وَٱللَّهُ أَمَرَنَا بِهَا ۗ قُلْ إِنَّ ٱللَّهَ لَا يَأْمُرُ بِٱلْفَحْشَآءِ ۖ أَتَقُولُونَ عَلَى ٱللَّهِ مَا لَا تَعْلَمُونَ
And when they do some lewdness they say: We found our fathers doing it and Allah hath enjoined it on us. Say: Allah, verily, enjoineth not lewdness. Tell ye concerning Allah that which ye know not?
Surah Al-A'raaf(7:28)