Well, the Hijri date 10 Rajab 1340 corresponds to the Gregorian date Wednesday, 8 March 1922. This date lies in the seventh month of the Hijri year 1340 AH, which is Rajab of 1340 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1340/07/10 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 8 March 1922 to its equivalent Arabic date.
The following is the conversion of the Arabic date 10 Rajab 1340 AH to its equivalent Gregorian date.
وَسِيقَ ٱلَّذِينَ كَفَرُوٓا۟ إِلَىٰ جَهَنَّمَ زُمَرًا ۖ حَتَّىٰٓ إِذَا جَآءُوهَا فُتِحَتْ أَبْوَٰبُهَا وَقَالَ لَهُمْ خَزَنَتُهَآ أَلَمْ يَأْتِكُمْ رُسُلٌۭ مِّنكُمْ يَتْلُونَ عَلَيْكُمْ ءَايَٰتِ رَبِّكُمْ وَيُنذِرُونَكُمْ لِقَآءَ يَوْمِكُمْ هَٰذَا ۚ قَالُوا۟ بَلَىٰ وَلَٰكِنْ حَقَّتْ كَلِمَةُ ٱلْعَذَابِ عَلَى ٱلْكَٰفِرِينَ
And those who disbelieve are driven unto hell in troops till, when they reach it and the gates thereof are opened, and the warders thereof say unto them: Came there not unto you messengers of your own, reciting unto you the revelations of your Lord and warning you of the meeting of this your Day? they say: Yea, verily. But the word of doom of disbelievers is fulfilled.
Surah Az-Zumar(39:71)