Well, the Hijri date 20 Shaban 1304 corresponds to the Gregorian date Friday, 13 May 1887. This date lies in the eighth month of the Hijri year 1304 AH, which is Shaban of 1304 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1304/08/20 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 13 May 1887 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Shaban 1304 AH to its equivalent Gregorian date.
وَمَا نَتَنَزَّلُ إِلَّا بِأَمْرِ رَبِّكَ ۖ لَهُۥ مَا بَيْنَ أَيْدِينَا وَمَا خَلْفَنَا وَمَا بَيْنَ ذَٰلِكَ ۚ وَمَا كَانَ رَبُّكَ نَسِيًّۭا
We (angels) come not down save by commandment of thy Lord. Unto Him belongeth all that is before us and all that is behind us and all that is between those two, and thy Lord was never forgetful -
Surah Maryam(19:64)