Well, the Hijri date 20 Jumada Al Oula 1473 corresponds to the Gregorian date Thursday, 2 February 2051. This date lies in the fifth month of the Hijri year 1473 AH, which is Jumada Al-Awwal of 1473 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1473/05/20 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 2 February 2051 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Jumada Al Oula 1473 AH to its equivalent Gregorian date.
وَإِن تَدْعُوهُمْ إِلَى ٱلْهُدَىٰ لَا يَتَّبِعُوكُمْ ۚ سَوَآءٌ عَلَيْكُمْ أَدَعَوْتُمُوهُمْ أَمْ أَنتُمْ صَٰمِتُونَ
And if ye call them to the Guidance, they follow you not. Whether ye call them or are silent is all one for you.
Surah Al-A'raaf(7:193)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter: Ghazwa Dhul-Khalasa
Narrated Qais:
Jarir said "Allah's Messenger (ﷺ) said to me, "Won't you relieve me from Dhul-Khalasa?" I replied, "Yes, (I will relieve you)." So I proceeded along with one-hundred and fifty cavalry from Ahmas tribe who were skillful in riding horses. I used not to sit firm over horses, so I informed the Prophet (ﷺ) of that, and he stroke my chest with his hand till I saw the marks of his hand over my chest and he said, O Allah! Make him firm and one who guides others and is guided (on the right path).' Since then I have never fallen from a horse. Dhul-l--Khulasa was a house in Yemen belonging to the tribe of Khatham and Bajaila, and in it there were idols which were worshipped, and it was called Al-Ka`ba." Jarir went there, burnt it with fire and dismantled it. When Jarir reached Yemen, there was a man who used to foretell and give good omens by casting arrows of divination. Someone said to him. "The messenger of Allah's Messenger (ﷺ) is present here and if he should get hold of you, he would chop off your neck." One day while he was using them (i.e. arrows of divination), Jarir stopped there and said to him, "Break them (i.e. the arrows) and testify that None has the right to be worshipped except Allah, or else I will chop off your neck." So the man broke those arrows and testified that none has the right to be worshipped except Allah. Then Jarir sent a man called Abu Artata from the tribe of Ahmas to the Prophet to convey the good news (of destroying Dhu-l-Khalasa). So when the messenger reached the Prophet, he said, "O Allah's Messenger (ﷺ)! By Him Who sent you with the Truth, I did not leave it till it was like a scabby camel." Then the Prophet (ﷺ) blessed the horses of Ahmas and their men five times.
Sahih al-Bukhari 4357