Well, the Hijri date 12 Rabi Al Thani 1277 corresponds to the Gregorian date Saturday, 27 October 1860. This date lies in the fourth month of the Hijri year 1277 AH, which is Rabi Al-Thani of 1277 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1277/04/12 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 27 October 1860 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Rabi Al Thani 1277 AH to its equivalent Gregorian date.
وَٱلَّذِينَ ءَامَنُوا۟ وَٱتَّبَعَتْهُمْ ذُرِّيَّتُهُم بِإِيمَٰنٍ أَلْحَقْنَا بِهِمْ ذُرِّيَّتَهُمْ وَمَآ أَلَتْنَٰهُم مِّنْ عَمَلِهِم مِّن شَىْءٍۢ ۚ كُلُّ ٱمْرِئٍۭ بِمَا كَسَبَ رَهِينٌۭ
And they who believe and whose seed follow them in faith, We cause their seed to join them (there), and We deprive them of nought of their (life's) work. Every man is a pledge for that which he hath earned.
Surah At-Tur(52:21)