Well, the Hijri date 13 Shaban 1511 corresponds to the Gregorian date Saturday, 6 March 2088. This date lies in the eighth month of the Hijri year 1511 AH, which is Shaban of 1511 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1511/08/13 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 6 March 2088 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Shaban 1511 AH to its equivalent Gregorian date.
ذَٰلِكَ بِأَنَّهُۥ كَانَت تَّأْتِيهِمْ رُسُلُهُم بِٱلْبَيِّنَٰتِ فَقَالُوٓا۟ أَبَشَرٌۭ يَهْدُونَنَا فَكَفَرُوا۟ وَتَوَلَّوا۟ ۚ وَّٱسْتَغْنَى ٱللَّهُ ۚ وَٱللَّهُ غَنِىٌّ حَمِيدٌۭ
That was because their messengers (from Allah) kept coming unto them with clear proofs (of Allah's Sovereignty), but they said: Shall mere mortals guide us? So they disbelieved and turned away, and Allah was independent (of them). Allah is Absolute, Owner of Praise.
Surah At-Taghaabun(64:6)