Well, the Hijri date 23 Safar 1511 corresponds to the Gregorian date Sunday, 21 September 2087. This date lies in the second month of the Hijri year 1511 AH, which is Safar of 1511 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1511/02/23 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 September 2087 to its equivalent Arabic date.
The following is the conversion of the Arabic date 23 Safar 1511 AH to its equivalent Gregorian date.
حَتَّىٰٓ إِذَا بَلَغَ مَغْرِبَ ٱلشَّمْسِ وَجَدَهَا تَغْرُبُ فِى عَيْنٍ حَمِئَةٍۢ وَوَجَدَ عِندَهَا قَوْمًۭا ۗ قُلْنَا يَٰذَا ٱلْقَرْنَيْنِ إِمَّآ أَن تُعَذِّبَ وَإِمَّآ أَن تَتَّخِذَ فِيهِمْ حُسْنًۭا
Till, when he reached the setting-place of the sun, he found it setting in a muddy spring, and found a people thereabout. We said: O Dhu'l-Qarneyn! Either punish or show them kindness.
Surah Al-Kahf(18:86)