Well, the Hijri date 26 Dhul Qidah 1255 corresponds to the Gregorian date Thursday, 30 January 1840. This date lies in the eleventh month of the Hijri year 1255 AH, which is Dhu Al-Qidah of 1255 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1255/11/26 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 30 January 1840 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Dhul Qidah 1255 AH to its equivalent Gregorian date.
وَهُوَ ٱلَّذِى يَتَوَفَّىٰكُم بِٱلَّيْلِ وَيَعْلَمُ مَا جَرَحْتُم بِٱلنَّهَارِ ثُمَّ يَبْعَثُكُمْ فِيهِ لِيُقْضَىٰٓ أَجَلٌۭ مُّسَمًّۭى ۖ ثُمَّ إِلَيْهِ مَرْجِعُكُمْ ثُمَّ يُنَبِّئُكُم بِمَا كُنتُمْ تَعْمَلُونَ
He it is Who gathereth you at night and knoweth that which ye commit by day. Then He raiseth you again to life therein, that the term appointed (for you) may be accomplished. And afterward unto Him is your return. Then He will proclaim unto you what ye used to do.
Surah Al-An'aam(6:60)