Well, the Hijri date 29 Shawwal 1143 corresponds to the Gregorian date Sunday, 6 May 1731. This date lies in the tenth month of the Hijri year 1143 AH, which is Shawwal of 1143 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1143/10/29 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 May 1731 to its equivalent Arabic date.
The following is the conversion of the Arabic date 29 Shawwal 1143 AH to its equivalent Gregorian date.
وَلَقَدْ أَتَوْا۟ عَلَى ٱلْقَرْيَةِ ٱلَّتِىٓ أُمْطِرَتْ مَطَرَ ٱلسَّوْءِ ۚ أَفَلَمْ يَكُونُوا۟ يَرَوْنَهَا ۚ بَلْ كَانُوا۟ لَا يَرْجُونَ نُشُورًۭا
And indeed they have passed by the township whereon was rained the fatal rain. Can it be that they have not seen it? Nay, but they hope for no resurrection.
Surah Al-Furqaan(25:40)