Well, the Hijri date 1 Rajab 1373 corresponds to the Gregorian date Saturday, 6 March 1954. This date lies in the seventh month of the Hijri year 1373 AH, which is Rajab of 1373 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1373/07/01 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 6 March 1954 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Rajab 1373 AH to its equivalent Gregorian date.
إِنَّهُمْ عَنِ ٱلسَّمْعِ لَمَعْزُولُونَ
Lo! verily they are banished from the hearing.
Surah Ash-Shu'araa(26:212)
Sahih al-Bukhari
Divorce
Chapter: Marrying Al-Mushrikat who had embraced Islam; and their 'Idda.
Narrated Ibn 'Abbas:
The pagans were of two kinds as regards their relationship to the Prophet and the Believers. Some of them were those with whom the Prophet was at war and used to fight against, and they used to fight him; the others were those with whom the Prophet (ﷺ) made a treaty, and neither did the Prophet (ﷺ) fight them, nor did they fight him. If a lady from the first group of pagans emigrated towards the Muslims, her hand would not be asked in marriage unless she got the menses and then became clean. When she became clean, it would be lawful for her to get married, and if her husband emigrated too before she got married, then she would be returned to him. If any slave or female slave emigrated from them to the Muslims, then they would be considered free persons (not slaves) and they would have the same rights as given to other emigrants. The narrator then mentioned about the pagans involved with the Muslims in a treaty, the same as occurs in Mujahid's narration. If a male slave or a female slave emigrated from such pagans as had made a treaty with the Muslims, they would not be returned, but their prices would be paid (to the pagans).
Sahih al-Bukhari 5286