Well, the Hijri date 6 Shawwal 1280 corresponds to the Gregorian date Monday, 14 March 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 Monday without any doubt. The Arabic date 1280/10/06 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 14 March 1864 to its equivalent Arabic date.
The following is the conversion of the Arabic date 6 Shawwal 1280 AH to its equivalent Gregorian date.
وَسِيقَ ٱلَّذِينَ كَفَرُوٓا۟ إِلَىٰ جَهَنَّمَ زُمَرًا ۖ حَتَّىٰٓ إِذَا جَآءُوهَا فُتِحَتْ أَبْوَٰبُهَا وَقَالَ لَهُمْ خَزَنَتُهَآ أَلَمْ يَأْتِكُمْ رُسُلٌۭ مِّنكُمْ يَتْلُونَ عَلَيْكُمْ ءَايَٰتِ رَبِّكُمْ وَيُنذِرُونَكُمْ لِقَآءَ يَوْمِكُمْ هَٰذَا ۚ قَالُوا۟ بَلَىٰ وَلَٰكِنْ حَقَّتْ كَلِمَةُ ٱلْعَذَابِ عَلَى ٱلْكَٰفِرِينَ
And those who disbelieve are driven unto hell in troops till, when they reach it and the gates thereof are opened, and the warders thereof say unto them: Came there not unto you messengers of your own, reciting unto you the revelations of your Lord and warning you of the meeting of this your Day? they say: Yea, verily. But the word of doom of disbelievers is fulfilled.
Surah Az-Zumar(39:71)