Well, the Hijri date 21 Rajab 1607 corresponds to the Gregorian date Thursday, 5 April 2181. This date lies in the seventh month of the Hijri year 1607 AH, which is Rajab of 1607 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1607/07/21 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 5 April 2181 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rajab 1607 AH to its equivalent Gregorian date.
ٱتَّخَذُوٓا۟ أَحْبَارَهُمْ وَرُهْبَٰنَهُمْ أَرْبَابًۭا مِّن دُونِ ٱللَّهِ وَٱلْمَسِيحَ ٱبْنَ مَرْيَمَ وَمَآ أُمِرُوٓا۟ إِلَّا لِيَعْبُدُوٓا۟ إِلَٰهًۭا وَٰحِدًۭا ۖ لَّآ إِلَٰهَ إِلَّا هُوَ ۚ سُبْحَٰنَهُۥ عَمَّا يُشْرِكُونَ
They have taken as lords beside Allah their rabbis and their monks and the Messiah son of Mary, when they were bidden to worship only One Allah. There is no Allah save Him. Be He Glorified from all that they ascribe as partner (unto Him)!
Surah At-Tawba(9:31)