Well, the Hijri date 17 Rabi Al Thani 1255 corresponds to the Gregorian date Saturday, 29 June 1839. This date lies in the fourth month of the Hijri year 1255 AH, which is Rabi Al-Thani of 1255 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1255/04/17 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 June 1839 to its equivalent Arabic date.
The following is the conversion of the Arabic date 17 Rabi Al Thani 1255 AH to its equivalent Gregorian date.
إِذْ قَالَ يُوسُفُ لِأَبِيهِ يَٰٓأَبَتِ إِنِّى رَأَيْتُ أَحَدَ عَشَرَ كَوْكَبًۭا وَٱلشَّمْسَ وَٱلْقَمَرَ رَأَيْتُهُمْ لِى سَٰجِدِينَ
When Joseph said unto his father: O my father! Lo! I saw in a dream eleven planets and the sun and the moon, I saw them prostrating themselves unto me.
Surah Yusuf(12:4)