Well, the Hijri date 21 Rajab 1380 corresponds to the Gregorian date Sunday, 8 January 1961. This date lies in the seventh month of the Hijri year 1380 AH, which is Rajab of 1380 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1380/07/21 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 8 January 1961 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rajab 1380 AH to its equivalent Gregorian date.
قُلِ ٱللَّهُ أَعْلَمُ بِمَا لَبِثُوا۟ ۖ لَهُۥ غَيْبُ ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ ۖ أَبْصِرْ بِهِۦ وَأَسْمِعْ ۚ مَا لَهُم مِّن دُونِهِۦ مِن وَلِىٍّۢ وَلَا يُشْرِكُ فِى حُكْمِهِۦٓ أَحَدًۭا
Say: Allah is Best Aware how long they tarried. His is the Invisible of the heavens and the earth. How clear of sight is He and keen of hearing! They have no protecting friend beside Him, and He maketh none to share in His government.
Surah Al-Kahf(18:26)