Well, the Hijri date 20 Dhul Qidah 1267 corresponds to the Gregorian date Monday, 15 September 1851. This date lies in the eleventh month of the Hijri year 1267 AH, which is Dhu Al-Qidah of 1267 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1267/11/20 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 15 September 1851 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Dhul Qidah 1267 AH to its equivalent Gregorian date.
فَذَرْهُمْ يَخُوضُوا۟ وَيَلْعَبُوا۟ حَتَّىٰ يُلَٰقُوا۟ يَوْمَهُمُ ٱلَّذِى يُوعَدُونَ
So let them flounder (in their talk) and play until they meet the Day which they are promised.
Surah Az-Zukhruf(43:83)