Well, the Hijri date 21 Rabi Al Thani 1266 corresponds to the Gregorian date Tuesday, 5 March 1850. This date lies in the fourth month of the Hijri year 1266 AH, which is Rabi Al-Thani of 1266 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1266/04/21 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 5 March 1850 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1266 AH to its equivalent Gregorian date.
وَلَوْ نَزَّلْنَٰهُ عَلَىٰ بَعْضِ ٱلْأَعْجَمِينَ
And if We had revealed it unto one of any other nation than the Arabs,
Surah Ash-Shu'araa(26:198)