Well, the Hijri date 1 Rabi Al Thani 1380 corresponds to the Gregorian date Wednesday, 21 September 1960. This date lies in the fourth month of the Hijri year 1380 AH, which is Rabi Al-Thani of 1380 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1380/04/01 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.
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 21 September 1960 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Rabi Al Thani 1380 AH to its equivalent Gregorian date.
بَلَىٰ مَن كَسَبَ سَيِّئَةًۭ وَأَحَٰطَتْ بِهِۦ خَطِيٓـَٔتُهُۥ فَأُو۟لَٰٓئِكَ أَصْحَٰبُ ٱلنَّارِ ۖ هُمْ فِيهَا خَٰلِدُونَ
Nay, but whosoever hath done evil and his sin surroundeth him; such are rightful owners of the Fire; they will abide therein.
Surah Al-Baqara(2:81)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah "And indeed, We have bestowed upon you seven Al-Mathãni (i.e., seven repeatedly recited Verses i.e., Sürat AI-Fatiha) and the Grand Qur'an." (V.15:87)
Narrated Abu Sa`id Al-Mualla:
While I was praying, the Prophet (ﷺ) passed by and called me, but I did not go to him till I had finished my prayer. When I went to him, he said, "What prevented you from coming?" I said, "I was praying." He said, "Didn't Allah say" "O you who believes Give your response to Allah (by obeying Him) and to His Apostle." (8.24) Then he added, "Shall I tell you the most superior Sura in the Qur'an before I go out of the mosque?" When the Prophet (ﷺ) intended to go out (of the Mosque), I reminded him and he said, "That is: "Al hamdu-li l-lahi Rabbil-`alamin (Surat-al-fatiha)' which is the seven oft repeated verses (Al-Mathani) and the Grand Qur'an which has been given to me."
Sahih al-Bukhari 4703