Well, the Hijri date 20 Rabi Al Thani 1375 corresponds to the Gregorian date Sunday, 4 December 1955. This date lies in the fourth month of the Hijri year 1375 AH, which is Rabi Al-Thani of 1375 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1375/04/20 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 4 December 1955 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rabi Al Thani 1375 AH to its equivalent Gregorian date.
وَقَالَ ٱلَّذِينَ ٱتَّبَعُوا۟ لَوْ أَنَّ لَنَا كَرَّةًۭ فَنَتَبَرَّأَ مِنْهُمْ كَمَا تَبَرَّءُوا۟ مِنَّا ۗ كَذَٰلِكَ يُرِيهِمُ ٱللَّهُ أَعْمَٰلَهُمْ حَسَرَٰتٍ عَلَيْهِمْ ۖ وَمَا هُم بِخَٰرِجِينَ مِنَ ٱلنَّارِ
And those who were but followers will say: If a return were possible for us, we would disown them even as they have disowned us. Thus will Allah show them their own deeds as anguish for them, and they will not emerge from the Fire.
Surah Al-Baqara(2:167)