Well, the Hijri date 11 Rabi Al Thani 1400 corresponds to the Gregorian date Wednesday, 27 February 1980. This date lies in the fourth month of the Hijri year 1400 AH, which is Rabi Al-Thani of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1400/04/11 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 27 February 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Rabi Al Thani 1400 AH to its equivalent Gregorian date.
إِنَّ أَوْلَى ٱلنَّاسِ بِإِبْرَٰهِيمَ لَلَّذِينَ ٱتَّبَعُوهُ وَهَٰذَا ٱلنَّبِىُّ وَٱلَّذِينَ ءَامَنُوا۟ ۗ وَٱللَّهُ وَلِىُّ ٱلْمُؤْمِنِينَ
Lo! those of mankind who have the best claim to Abraham are those who followed him, and this Prophet and those who believe (with him); and Allah is the Protecting Guardian of the believers.
Surah Aal-i-Imraan(3:68)