Well, the Hijri date 21 Rabi Al Thani 1366 corresponds to the Gregorian date Friday, 14 March 1947. This date lies in the fourth month of the Hijri year 1366 AH, which is Rabi Al-Thani of 1366 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1366/04/21 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 14 March 1947 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Thani 1366 AH to its equivalent Gregorian date.
إِلَّا ٱلَّذِينَ تَابُوا۟ وَأَصْلَحُوا۟ وَٱعْتَصَمُوا۟ بِٱللَّهِ وَأَخْلَصُوا۟ دِينَهُمْ لِلَّهِ فَأُو۟لَٰٓئِكَ مَعَ ٱلْمُؤْمِنِينَ ۖ وَسَوْفَ يُؤْتِ ٱللَّهُ ٱلْمُؤْمِنِينَ أَجْرًا عَظِيمًۭا
Save those who repent and amend and hold fast to Allah and make their religion pure for Allah (only). Those are with the believers. And Allah will bestow on the believers an immense reward.
Surah An-Nisaa(4:146)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
"And (remember) when Ibrãhim (Abraham) said: My Lord! Show me how You give life to the dead..." (V.2:260)
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "We have more right to be in doubt than Abraham when he said, 'My Lord! Show me how You give life to the dead.' He said, 'Do you not believe?' He said, 'Yes (I believe) but to be stronger in Faith.' "(2.260)
Sahih al-Bukhari 4537