Well, the Hijri date 20 Shawwal 1373 corresponds to the Gregorian date Monday, 21 June 1954. This date lies in the tenth month of the Hijri year 1373 AH, which is Shawwal of 1373 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1373/10/20 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 1954 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Shawwal 1373 AH to its equivalent Gregorian date.
قَالَ لِمَنْ حَوْلَهُۥٓ أَلَا تَسْتَمِعُونَ
(Pharaoh) said unto those around him: Hear ye not?
Surah Ash-Shu'araa(26:25)
Sahih al-Bukhari
Merits of the Helpers in Madinah (Ansaar)
Chapter
Narrated Abu Al-Minhal `AbdurRahman bin Mut`im:
A partner of mine sold some Dirhams on credit in the market. I said, "Glorified be Allah! Is this legal?" He replied, "Glorified be Allah! By Allah, when I sold them in the market, nobody objected to it." Then I asked Al-Bara' bin `Azib (about it) he said, "We used to make such a transaction when the Prophet came to Medina. So he said, 'There is no harm in it if it is done from hand to hand, but it is not allowed on credit.' Go to Zaid bin Al- Arqam and ask him about it for he was the greatest trader of all of us." So I asked Zaid bin Al-Arqam., and he said the same (as Al-Bara) did."
Sahih al-Bukhari 3939, 3940