Well, the Hijri date 6 Shawwal 1255 corresponds to the Gregorian date Thursday, 12 December 1839. This date lies in the tenth month of the Hijri year 1255 AH, which is Shawwal of 1255 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1255/10/06 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 12 December 1839 to its equivalent Arabic date.
The following is the conversion of the Arabic date 6 Shawwal 1255 AH to its equivalent Gregorian date.
أَلَمْ يَأْتِكُمْ نَبَؤُا۟ ٱلَّذِينَ كَفَرُوا۟ مِن قَبْلُ فَذَاقُوا۟ وَبَالَ أَمْرِهِمْ وَلَهُمْ عَذَابٌ أَلِيمٌۭ
Hath not the story reached you of those who disbelieved of old and so did taste the ill-effects of their conduct, and theirs will be a painful doom.
Surah At-Taghaabun(64:5)