Well, the Hijri date 29 Dhul Hijjah 1235 corresponds to the Gregorian date Friday, 6 October 1820. This date lies in the twelfth month of the Hijri year 1235 AH, which is Dhu Al-Hijjah of 1235 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1235/12/29 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 6 October 1820 to its equivalent Arabic date.
The following is the conversion of the Arabic date 29 Dhul Hijjah 1235 AH to its equivalent Gregorian date.
۞ وَلَوْ أَرَادُوا۟ ٱلْخُرُوجَ لَأَعَدُّوا۟ لَهُۥ عُدَّةًۭ وَلَٰكِن كَرِهَ ٱللَّهُ ٱنۢبِعَاثَهُمْ فَثَبَّطَهُمْ وَقِيلَ ٱقْعُدُوا۟ مَعَ ٱلْقَٰعِدِينَ
And if they had wished to go forth they would assuredly have made ready some equipment, but Allah was averse to their being sent forth and held them back and it was said (unto them): Sit ye with the sedentary!
Surah At-Tawba(9:46)