Well, the Hijri date 17 Rabi Al Thani 1409 corresponds to the Gregorian date Saturday, 26 November 1988. This date lies in the fourth month of the Hijri year 1409 AH, which is Rabi Al-Thani of 1409 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1409/04/17 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 26 November 1988 to its equivalent Arabic date.
The following is the conversion of the Arabic date 17 Rabi Al Thani 1409 AH to its equivalent Gregorian date.
أَسْبَٰبَ ٱلسَّمَٰوَٰتِ فَأَطَّلِعَ إِلَىٰٓ إِلَٰهِ مُوسَىٰ وَإِنِّى لَأَظُنُّهُۥ كَٰذِبًۭا ۚ وَكَذَٰلِكَ زُيِّنَ لِفِرْعَوْنَ سُوٓءُ عَمَلِهِۦ وَصُدَّ عَنِ ٱلسَّبِيلِ ۚ وَمَا كَيْدُ فِرْعَوْنَ إِلَّا فِى تَبَابٍۢ
The roads of the heavens, and may look upon the god of Moses, though verily I think him a liar. Thus was the evil that he did made fairseeming unto Pharaoh, and he was debarred from the (right) way. The plot of Pharaoh ended but in ruin.
Surah Ghafir(40:37)