Well, the Hijri date 20 Rabi Al Awwal 1366 corresponds to the Gregorian date Tuesday, 11 February 1947. This date lies in the third month of the Hijri year 1366 AH, which is Rabi Al-Awwal of 1366 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1366/03/20 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 11 February 1947 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rabi Al Awwal 1366 AH to its equivalent Gregorian date.
وَمِن قَبْلِهِۦ كِتَٰبُ مُوسَىٰٓ إِمَامًۭا وَرَحْمَةًۭ ۚ وَهَٰذَا كِتَٰبٌۭ مُّصَدِّقٌۭ لِّسَانًا عَرَبِيًّۭا لِّيُنذِرَ ٱلَّذِينَ ظَلَمُوا۟ وَبُشْرَىٰ لِلْمُحْسِنِينَ
When before it there was the Scripture of Moses, an example and a mercy; and this is a confirming Scripture in the Arabic language, that it may warn those who do wrong and bring good tidings for the righteous.
Surah Al-Ahqaf(46:12)