Well, the Hijri date 21 Rabi Al Awwal 1377 corresponds to the Gregorian date Monday, 14 October 1957. This date lies in the third month of the Hijri year 1377 AH, which is Rabi Al-Awwal of 1377 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1377/03/21 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 14 October 1957 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Awwal 1377 AH to its equivalent Gregorian date.
۞ وَعِندَهُۥ مَفَاتِحُ ٱلْغَيْبِ لَا يَعْلَمُهَآ إِلَّا هُوَ ۚ وَيَعْلَمُ مَا فِى ٱلْبَرِّ وَٱلْبَحْرِ ۚ وَمَا تَسْقُطُ مِن وَرَقَةٍ إِلَّا يَعْلَمُهَا وَلَا حَبَّةٍۢ فِى ظُلُمَٰتِ ٱلْأَرْضِ وَلَا رَطْبٍۢ وَلَا يَابِسٍ إِلَّا فِى كِتَٰبٍۢ مُّبِينٍۢ
And with Him are the keys of the Invisible. None but He knoweth them. And He knoweth what is in the land and the sea. Not a leaf falleth but He knoweth it, not a grain amid the darkness of the earth, naught of wet or dry but (it is noted) in a clear record.
Surah Al-An'aam(6:59)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter: The killing of Abu Jahl
Narrated Abu Dhar:
The following Holy Verse:-- "These two opponents (believers & disbelievers) dispute with each other about their Lord," (22.19) was revealed concerning six men from Quraish, namely, `Ali, Hamza, 'Ubaida bin Al-Harith; Shaiba bin Rabi`a, `Utba bin Rabi`a and Al-Walid bin `Utba.
Sahih al-Bukhari 3966