Well, the Hijri date 7 Safar 1377 corresponds to the Gregorian date Sunday, 1 September 1957. This date lies in the second month of the Hijri year 1377 AH, which is Safar of 1377 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1377/02/07 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 1 September 1957 to its equivalent Arabic date.
The following is the conversion of the Arabic date 7 Safar 1377 AH to its equivalent Gregorian date.
وَلِكُلِّ أُمَّةٍۢ رَّسُولٌۭ ۖ فَإِذَا جَآءَ رَسُولُهُمْ قُضِىَ بَيْنَهُم بِٱلْقِسْطِ وَهُمْ لَا يُظْلَمُونَ
And for every nation there is a messenger. And when their messenger cometh (on the Day of Judgment) it will be judged between them fairly, and they will not be wronged.
Surah Yunus(10:47)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah ta'ala: "And [He has sent him (Prophet Muḥammad pbuh) also to] others among them (Muslims) who have not yet joined them..." (V.62:3)
Narrated Abu Huraira:
While we were sitting with the Prophet (ﷺ) Surat Al-Jumu'a was revealed to him, and when the Verse, "And He (Allah) has sent him (Muhammad) also to other (Muslims).....' (62.3) was recited by the Prophet, I said, "Who are they, O Allah's Messenger (ﷺ)?" The Prophet (ﷺ) did not reply till I repeated my question thrice. At that time, Salman Al-Farisi was with us. So Allah's Messenger (ﷺ) put his hand on Salman, saying, "If Faith were at (the place of) Ath-Thuraiya (pleiades, the highest star), even then (some men or man from these people (i.e. Salman's folk) would attain it."
Sahih al-Bukhari 4897