Well, the Hijri date 3 Muharram 1370 corresponds to the Gregorian date Saturday, 14 October 1950. This date lies in the first month of the Hijri year 1370 AH, which is Muharram of 1370 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1370/01/03 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 14 October 1950 to its equivalent Arabic date.
The following is the conversion of the Arabic date 3 Muharram 1370 AH to its equivalent Gregorian date.
فَٱلْفَٰرِقَٰتِ فَرْقًۭا
By those who winnow with a winnowing,
Surah Al-Mursalaat(77:4)
Sahih al-Bukhari
Manumission of Slaves
Chapter: Whoever possessed Arab slaves
Narrated Marwan and Al-Miswar bin Makhrama:
When the delegates of the tribe of Hawazin came to the Prophet (ﷺ) and they requested him to return their properties and captives. The Prophet (ﷺ) stood up and said to them, "I have other people with me in this matter (as you see) and the most beloved statement to me is the true one; you may choose either the properties or the prisoners as I have delayed their distribution." The Prophet (ﷺ) had waited for them for more than ten days since his arrival from Ta'if. So, when it became evident to them that the Prophet (ﷺ) was not going to return them except one of the two, they said, "We choose our prisoners." The Prophet got up amongst the people and glorified and praised Allah as He deserved and said, "Then after, these brethren of yours have come to us with repentance, and I see it logical to return them the captives. So, whoever amongst you likes to do that as a favor, then he can do it, and whoever of you likes to stick to his share till we recompense him from the very first war booty which Allah will give us, then he can do so (i.e. give up the present captives)." The people unanimously said, "We do that (return the captives) willingly." The Prophet (ﷺ) said, "We do not know which of you has agreed to it and which have not, so go back and let your leaders forward us your decision." So, all the people then went back and discussed the matter with their leaders who returned and informed the Prophet (ﷺ) that all the people had willingly given their consent to return the captives. This is what has reached us about the captives of Hawazin. Narrated Anas that `Abbas said to the Prophet, "I paid for my ransom and `Aqil's ransom."
Sahih al-Bukhari 2539, 2540