Well, the Hijri date 15 Rajab 1190 corresponds to the Gregorian date Thursday, 29 August 1776. This date lies in the seventh month of the Hijri year 1190 AH, which is Rajab of 1190 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1190/07/15 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 29 August 1776 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Rajab 1190 AH to its equivalent Gregorian date.
زَعَمَ ٱلَّذِينَ كَفَرُوٓا۟ أَن لَّن يُبْعَثُوا۟ ۚ قُلْ بَلَىٰ وَرَبِّى لَتُبْعَثُنَّ ثُمَّ لَتُنَبَّؤُنَّ بِمَا عَمِلْتُمْ ۚ وَذَٰلِكَ عَلَى ٱللَّهِ يَسِيرٌۭ
Those who disbelieve assert that they will not be raised again. Say (unto them, O Muhammad): Yea, verily, by my Lord! ye will be raised again and then ye will be informed of what ye did; and that is easy for Allah.
Surah At-Taghaabun(64:7)