Well, the Hijri date 26 Shawwal 1340 corresponds to the Gregorian date Wednesday, 21 June 1922. This date lies in the tenth month of the Hijri year 1340 AH, which is Shawwal of 1340 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1340/10/26 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 21 June 1922 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Shawwal 1340 AH to its equivalent Gregorian date.
هُوَ ٱلَّذِىٓ أَرْسَلَ رَسُولَهُۥ بِٱلْهُدَىٰ وَدِينِ ٱلْحَقِّ لِيُظْهِرَهُۥ عَلَى ٱلدِّينِ كُلِّهِۦ وَلَوْ كَرِهَ ٱلْمُشْرِكُونَ
He it is Who hath sent His messenger with the guidance and the Religion of Truth, that He may cause it to prevail over all religion, however much the idolaters may be averse.
Surah At-Tawba(9:33)