Well, the Hijri date 11 Rabi Al Thani 1380 corresponds to the Gregorian date Saturday, 1 October 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 Saturday without any doubt. The Arabic date 1380/04/11 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 October 1960 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Rabi Al Thani 1380 AH to its equivalent Gregorian date.
وَرَبُّكَ ٱلْغَنِىُّ ذُو ٱلرَّحْمَةِ ۚ إِن يَشَأْ يُذْهِبْكُمْ وَيَسْتَخْلِفْ مِنۢ بَعْدِكُم مَّا يَشَآءُ كَمَآ أَنشَأَكُم مِّن ذُرِّيَّةِ قَوْمٍ ءَاخَرِينَ
Surah Al-An'aam(6:133)
Sahih al-Bukhari
Prayer at Night (Tahajjud)
Chapter: To offer two Rak'a before the Zuhr prayer
Narrated Ibn 'Umar:
I remember ten Rakat of Nawafil from the Prophet, two Rakat before the Zuhr prayer and two after it; two Rakat after Maghrib prayer in his house, and two Rakat after 'Isha' prayer in his house, and two Rakat before the Fajr prayer and at that time nobody would enter the house of the Prophet. Hafsa told me that the Prophet (ﷺ) used to offer two Rakat after the call maker had made the Adhan and the day had dawned.
Sahih al-Bukhari 1180, 1181