Well, the Hijri date 20 Rabi Al Thani 1192 corresponds to the Gregorian date Sunday, 17 May 1778. This date lies in the fourth month of the Hijri year 1192 AH, which is Rabi Al-Thani of 1192 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1192/04/20 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 17 May 1778 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rabi Al Thani 1192 AH to its equivalent Gregorian date.
وَٱلَّذِينَ ٱجْتَنَبُوا۟ ٱلطَّٰغُوتَ أَن يَعْبُدُوهَا وَأَنَابُوٓا۟ إِلَى ٱللَّهِ لَهُمُ ٱلْبُشْرَىٰ ۚ فَبَشِّرْ عِبَادِ
And those who put away false gods lest they should worship them and turn to Allah in repentance, for them there are glad tidings. Therefor give good tidings (O Muhammad) to My bondmen
Surah Az-Zumar(39:17)