Well, the Hijri date 21 Shawwal 1391 corresponds to the Gregorian date Thursday, 9 December 1971. This date lies in the tenth month of the Hijri year 1391 AH, which is Shawwal of 1391 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1391/10/21 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 9 December 1971 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Shawwal 1391 AH to its equivalent Gregorian date.
ثُمَّ بَعَثْنَٰهُمْ لِنَعْلَمَ أَىُّ ٱلْحِزْبَيْنِ أَحْصَىٰ لِمَا لَبِثُوٓا۟ أَمَدًۭا
And afterward We raised them up that We might know which of the two parties would best calculate the time that they had tarried.
Surah Al-Kahf(18:12)
