Well, the Hijri date 21 Safar 1509 corresponds to the Gregorian date Wednesday, 10 October 2085. This date lies in the second month of the Hijri year 1509 AH, which is Safar of 1509 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1509/02/21 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 10 October 2085 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Safar 1509 AH to its equivalent Gregorian date.
ذَٰلِكَ مِنْ أَنۢبَآءِ ٱلْغَيْبِ نُوحِيهِ إِلَيْكَ ۚ وَمَا كُنتَ لَدَيْهِمْ إِذْ يُلْقُونَ أَقْلَٰمَهُمْ أَيُّهُمْ يَكْفُلُ مَرْيَمَ وَمَا كُنتَ لَدَيْهِمْ إِذْ يَخْتَصِمُونَ
This is of the tidings of things hidden. We reveal it unto thee (Muhammad). Thou wast not present with them when they threw their pens (to know) which of them should be the guardian of Mary, nor wast thou present with them when they quarrelled (thereupon).
Surah Aal-i-Imraan(3:44)