Well, the Hijri date 12 Shawwal 1615 corresponds to the Gregorian date Sunday, 29 March 2189. This date lies in the tenth month of the Hijri year 1615 AH, which is Shawwal of 1615 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1615/10/12 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 29 March 2189 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Shawwal 1615 AH to its equivalent Gregorian date.
وَكَتَبْنَا لَهُۥ فِى ٱلْأَلْوَاحِ مِن كُلِّ شَىْءٍۢ مَّوْعِظَةًۭ وَتَفْصِيلًۭا لِّكُلِّ شَىْءٍۢ فَخُذْهَا بِقُوَّةٍۢ وَأْمُرْ قَوْمَكَ يَأْخُذُوا۟ بِأَحْسَنِهَا ۚ سَأُو۟رِيكُمْ دَارَ ٱلْفَٰسِقِينَ
And We wrote for him, upon the tablets, the lesson to be drawn from all things and the explanation of all things, then (bade him): Hold it fast; and command thy people (saying): Take the better (course made clear) therein. I shall show thee the abode of evil-livers.
Surah Al-A'raaf(7:145)