Well, the Hijri date 5 Rabi Al Thani 1257 corresponds to the Gregorian date Wednesday, 26 May 1841. This date lies in the fourth month of the Hijri year 1257 AH, which is Rabi Al-Thani of 1257 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1257/04/05 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 26 May 1841 to its equivalent Arabic date.
The following is the conversion of the Arabic date 5 Rabi Al Thani 1257 AH to its equivalent Gregorian date.
مَا كَانَ لِلنَّبِىِّ وَٱلَّذِينَ ءَامَنُوٓا۟ أَن يَسْتَغْفِرُوا۟ لِلْمُشْرِكِينَ وَلَوْ كَانُوٓا۟ أُو۟لِى قُرْبَىٰ مِنۢ بَعْدِ مَا تَبَيَّنَ لَهُمْ أَنَّهُمْ أَصْحَٰبُ ٱلْجَحِيمِ
It is not for the Prophet, and those who believe, to pray for the forgiveness of idolaters even though they may be near of kin (to them) after it hath become clear that they are people of hell-fire.
Surah At-Tawba(9:113)