Well, the Hijri date 23 Shawwal 1255 corresponds to the Gregorian date Sunday, 29 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 Sunday without any doubt. The Arabic date 1255/10/23 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 29 December 1839 to its equivalent Arabic date.
The following is the conversion of the Arabic date 23 Shawwal 1255 AH to its equivalent Gregorian date.
قُلْ إِن كَانَتْ لَكُمُ ٱلدَّارُ ٱلْءَاخِرَةُ عِندَ ٱللَّهِ خَالِصَةًۭ مِّن دُونِ ٱلنَّاسِ فَتَمَنَّوُا۟ ٱلْمَوْتَ إِن كُنتُمْ صَٰدِقِينَ
Say (unto them): If the abode of the Hereafter in the providence of Allah is indeed for you alone and not for others of mankind (as ye pretend), then long for death (for ye must long for death) if ye are truthful.
Surah Al-Baqara(2:94)