Well, the Hijri date 26 Rajab 1366 corresponds to the Gregorian date Sunday, 15 June 1947. This date lies in the seventh month of the Hijri year 1366 AH, which is Rajab of 1366 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1366/07/26 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 15 June 1947 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Rajab 1366 AH to its equivalent Gregorian date.
وَدُّوا۟ لَوْ تَكْفُرُونَ كَمَا كَفَرُوا۟ فَتَكُونُونَ سَوَآءًۭ ۖ فَلَا تَتَّخِذُوا۟ مِنْهُمْ أَوْلِيَآءَ حَتَّىٰ يُهَاجِرُوا۟ فِى سَبِيلِ ٱللَّهِ ۚ فَإِن تَوَلَّوْا۟ فَخُذُوهُمْ وَٱقْتُلُوهُمْ حَيْثُ وَجَدتُّمُوهُمْ ۖ وَلَا تَتَّخِذُوا۟ مِنْهُمْ وَلِيًّۭا وَلَا نَصِيرًا
They long that ye should disbelieve even as they disbelieve, that ye may be upon a level (with them). So choose not friends from them till they forsake their homes in the way of Allah; if they turn back (to enmity) then take them and kill them wherever ye find them, and choose no friend nor helper from among them,
Surah An-Nisaa(4:89)