Well, the Hijri date 1 Shaban 1391 corresponds to the Gregorian date Monday, 20 September 1971. This date lies in the eighth month of the Hijri year 1391 AH, which is Shaban of 1391 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1391/08/01 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 20 September 1971 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Shaban 1391 AH to its equivalent Gregorian date.
قَالُوا۟ ٱدْعُ لَنَا رَبَّكَ يُبَيِّن لَّنَا مَا هِىَ ۚ قَالَ إِنَّهُۥ يَقُولُ إِنَّهَا بَقَرَةٌۭ لَّا فَارِضٌۭ وَلَا بِكْرٌ عَوَانٌۢ بَيْنَ ذَٰلِكَ ۖ فَٱفْعَلُوا۟ مَا تُؤْمَرُونَ
They said: Pray for us unto thy Lord that He make clear to us what (cow) she is. (Moses) answered: Lo! He saith, Verily she is a cow neither with calf nor immature; (she is) between the two conditions; so do that which ye are commanded.
Surah Al-Baqara(2:68)