Well, the Hijri date 21 Rajab 1255 corresponds to the Gregorian date Sunday, 29 September 1839. This date lies in the seventh month of the Hijri year 1255 AH, which is Rajab of 1255 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1255/07/21 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 September 1839 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rajab 1255 AH to its equivalent Gregorian date.
وَٱتَّبِعُوٓا۟ أَحْسَنَ مَآ أُنزِلَ إِلَيْكُم مِّن رَّبِّكُم مِّن قَبْلِ أَن يَأْتِيَكُمُ ٱلْعَذَابُ بَغْتَةًۭ وَأَنتُمْ لَا تَشْعُرُونَ
And follow the better (guidance) of that which is revealed unto you from your Lord, before the doom cometh on you suddenly when ye know not,
Surah Az-Zumar(39:55)
