Well, the Hijri date 21 Dhul Hijjah 1221 corresponds to the Gregorian date Saturday, 28 February 1807. This date lies in the twelfth month of the Hijri year 1221 AH, which is Dhu Al-Hijjah of 1221 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1221/12/21 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 28 February 1807 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Dhul Hijjah 1221 AH to its equivalent Gregorian date.
وَكَذَٰلِكَ أَنزَلْنَٰهُ ءَايَٰتٍۭ بَيِّنَٰتٍۢ وَأَنَّ ٱللَّهَ يَهْدِى مَن يُرِيدُ
Thus We reveal it as plain revelations, and verily Allah guideth whom He will.
Surah Al-Hajj(22:16)