Well, the Hijri date 20 Jumada Al Oula 1371 corresponds to the Gregorian date Friday, 15 February 1952. This date lies in the fifth month of the Hijri year 1371 AH, which is Jumada Al-Awwal of 1371 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1371/05/20 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.
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The following is the conversion of the Gregorian date 15 February 1952 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Jumada Al Oula 1371 AH to its equivalent Gregorian date.
وَإِنَّ لَنَا لَلْءَاخِرَةَ وَٱلْأُولَىٰ
And lo! unto Us belong the latter portion and the former.
Surah Al-Lail(92:13)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter: The killing of Ab Rafi’ ‘Abdullah bin Abi Al-Huqaiq
Narrated Al-Bara:
Allah's Messenger (ﷺ) sent `Abdullah bin 'Atik and `Abdullah bin `Utba with a group of men to Abu Rafi` (to kill him). They proceeded till they approached his castle, whereupon `Abdullah bin Atik said to them, "Wait (here), and in the meantime I will go and see." `Abdullah said later on, "I played a trick in order to enter the castle. By chance, they lost a donkey of theirs and came out carrying a flaming light to search for it. I was afraid that they would recognize me, so I covered my head and legs and pretended to answer the call to nature. The gatekeeper called, 'Whoever wants to come in, should come in before I close the gate.' So I went in and hid myself in a stall of a donkey near the gate of the castle. They took their supper with Abu Rafi` and had a chat till late at night. Then they went back to their homes. When the voices vanished and I no longer detected any movement, I came out. I had seen where the gate-keeper had kept the key of the castle in a hole in the wall. I took it and unlocked the gate of the castle, saying to myself, 'If these people should notice me, I will run away easily.' Then I locked all the doors of their houses from outside while they were inside, and ascended to Abu Rafi` by a staircase. I saw the house in complete darkness with its light off, and I could not know where the man was. So I called, 'O Abu Rafi`!' He replied, 'Who is it?' I proceeded towards the voice and hit him. He cried loudly but my blow was futile. Then I came to him, pretending to help him, saying with a different tone of my voice, ' What is wrong with you, O Abu Rafi`?' He said, 'Are you not surprised? Woe on your mother! A man has come to me and hit me with a sword!' So again I aimed at him and hit him, but the blow proved futile again, and on that Abu Rafi` cried loudly and his wife got up. I came again and changed my voice as if I were a helper, and found Abu Rafi` lying straight on his back, so I drove the sword into his belly and bent on it till I heard the sound of a bone break. Then I came out, filled with astonishment and went to the staircase to descend, but I fell down from it and got my leg dislocated. I bandaged it and went to my companions limping. I said (to them), 'Go and tell Allah's Messenger (ﷺ) of this good news, but I will not leave (this place) till I hear the news of his (i.e. Abu Rafi`'s) death.' When dawn broke, an announcer of death got over the wall and announced, 'I convey to you the news of Abu Rafi`'s death.' I got up and proceeded without feeling any pain till I caught up with my companions before they reached the Prophet (ﷺ) to whom I conveyed the good news."
Sahih al-Bukhari 4040