Well, the Hijri date 19 Rabi Al Thani 1509 corresponds to the Gregorian date Thursday, 6 December 2085. This date lies in the fourth month of the Hijri year 1509 AH, which is Rabi Al-Thani of 1509 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1509/04/19 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 December 2085 to its equivalent Arabic date.
The following is the conversion of the Arabic date 19 Rabi Al Thani 1509 AH to its equivalent Gregorian date.
أَمْ يَقُولُونَ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًۭا ۖ فَإِن يَشَإِ ٱللَّهُ يَخْتِمْ عَلَىٰ قَلْبِكَ ۗ وَيَمْحُ ٱللَّهُ ٱلْبَٰطِلَ وَيُحِقُّ ٱلْحَقَّ بِكَلِمَٰتِهِۦٓ ۚ إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
Or say they: He hath invented a lie concerning Allah? If Allah willed, He could have sealed thy heart (against them). And Allah will wipe out the lie and will vindicate the truth by His words. Lo! He is Aware of what is hidden in the breasts (of men).
Surah Ash-Shura(42:24)