Well, the Hijri date 29 Shawwal 1280 corresponds to the Gregorian date Wednesday, 6 April 1864. This date lies in the tenth month of the Hijri year 1280 AH, which is Shawwal of 1280 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1280/10/29 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 April 1864 to its equivalent Arabic date.
The following is the conversion of the Arabic date 29 Shawwal 1280 AH to its equivalent Gregorian date.
ذَٰلِكَ بِأَنَّهُمُ ٱتَّبَعُوا۟ مَآ أَسْخَطَ ٱللَّهَ وَكَرِهُوا۟ رِضْوَٰنَهُۥ فَأَحْبَطَ أَعْمَٰلَهُمْ
That will be because they followed that which angereth Allah, and hated that which pleaseth Him. Therefor He hath made their actions vain.
Surah Muhammad(47:28)