Well, the Hijri date 29 Rabi Al Awwal 1340 corresponds to the Gregorian date Monday, 28 November 1921. This date lies in the third month of the Hijri year 1340 AH, which is Rabi Al-Awwal of 1340 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1340/03/29 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 28 November 1921 to its equivalent Arabic date.
The following is the conversion of the Arabic date 29 Rabi Al Awwal 1340 AH to its equivalent Gregorian date.
وَجَعَلْنَا ٱلسَّمَآءَ سَقْفًۭا مَّحْفُوظًۭا ۖ وَهُمْ عَنْ ءَايَٰتِهَا مُعْرِضُونَ
And we have made the sky a roof withheld (from them). Yet they turn away from its portents.
Surah Al-Anbiyaa(21:32)