Well, the Hijri date 16 Dhul Qidah 1255 corresponds to the Gregorian date Monday, 20 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 Monday without any doubt. The Arabic date 1255/11/16 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 20 January 1840 to its equivalent Arabic date.
The following is the conversion of the Arabic date 16 Dhul Qidah 1255 AH to its equivalent Gregorian date.
وَوَالِدٍۢ وَمَا وَلَدَ
And the begetter and that which he begat,
Surah Al-Balad(90:3)