Well, the Hijri date 6 Dhul Hijjah 1240 corresponds to the Gregorian date Thursday, 21 July 1825. This date lies in the twelfth month of the Hijri year 1240 AH, which is Dhu Al-Hijjah of 1240 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1240/12/06 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 21 July 1825 to its equivalent Arabic date.
The following is the conversion of the Arabic date 6 Dhul Hijjah 1240 AH to its equivalent Gregorian date.
وَلَوْ جَآءَتْهُمْ كُلُّ ءَايَةٍ حَتَّىٰ يَرَوُا۟ ٱلْعَذَابَ ٱلْأَلِيمَ
Though every token come unto them, till they see the painful doom.
Surah Yunus(10:97)