Well, the Hijri date 21 Dhul Hijjah 1607 corresponds to the Gregorian date Friday, 31 August 2181. This date lies in the twelfth month of the Hijri year 1607 AH, which is Dhu Al-Hijjah of 1607 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1607/12/21 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 31 August 2181 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Dhul Hijjah 1607 AH to its equivalent Gregorian date.
وَأَلْقَوْا۟ إِلَى ٱللَّهِ يَوْمَئِذٍ ٱلسَّلَمَ ۖ وَضَلَّ عَنْهُم مَّا كَانُوا۟ يَفْتَرُونَ
And they proffer unto Allah submission on that day, and all that they used to invent hath failed them.
Surah An-Nahl(16:87)