Well, the Hijri date 16 Rabi Al Thani 1257 corresponds to the Gregorian date Sunday, 6 June 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 Sunday without any doubt. The Arabic date 1257/04/16 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 6 June 1841 to its equivalent Arabic date.
The following is the conversion of the Arabic date 16 Rabi Al Thani 1257 AH to its equivalent Gregorian date.
وَعُرِضُوا۟ عَلَىٰ رَبِّكَ صَفًّۭا لَّقَدْ جِئْتُمُونَا كَمَا خَلَقْنَٰكُمْ أَوَّلَ مَرَّةٍۭ ۚ بَلْ زَعَمْتُمْ أَلَّن نَّجْعَلَ لَكُم مَّوْعِدًۭا
And they are set before thy Lord in ranks (and it is said unto them): Now verily have ye come unto Us as We created you at the first. But ye thought that We had set no tryst for you.
Surah Al-Kahf(18:48)