Well, the Hijri date 18 Rabi Al Awwal 1509 corresponds to the Gregorian date Monday, 5 November 2085. This date lies in the third month of the Hijri year 1509 AH, which is Rabi Al-Awwal of 1509 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1509/03/18 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 5 November 2085 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Rabi Al Awwal 1509 AH to its equivalent Gregorian date.
وَكَذَٰلِكَ أَوْحَيْنَآ إِلَيْكَ رُوحًۭا مِّنْ أَمْرِنَا ۚ مَا كُنتَ تَدْرِى مَا ٱلْكِتَٰبُ وَلَا ٱلْإِيمَٰنُ وَلَٰكِن جَعَلْنَٰهُ نُورًۭا نَّهْدِى بِهِۦ مَن نَّشَآءُ مِنْ عِبَادِنَا ۚ وَإِنَّكَ لَتَهْدِىٓ إِلَىٰ صِرَٰطٍۢ مُّسْتَقِيمٍۢ
And thus have We inspired in thee (Muhammad) a Spirit of Our command. Thou knewest not what the Scripture was, nor what the Faith. But We have made it a light whereby We guide whom We will of Our bondmen. And lo! thou verily dost guide unto a right path,
Surah Ash-Shura(42:52)