Well, the Hijri date 16 Shawwal 1409 corresponds to the Gregorian date Sunday, 21 May 1989. This date lies in the tenth month of the Hijri year 1409 AH, which is Shawwal of 1409 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1409/10/16 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 21 May 1989 to its equivalent Arabic date.
The following is the conversion of the Arabic date 16 Shawwal 1409 AH to its equivalent Gregorian date.
إِن يَشَأْ يُذْهِبْكُمْ أَيُّهَا ٱلنَّاسُ وَيَأْتِ بِـَٔاخَرِينَ ۚ وَكَانَ ٱللَّهُ عَلَىٰ ذَٰلِكَ قَدِيرًۭا
If He will, He can remove you, O people, and produce others (in your stead). Allah is Able to do that.
Surah An-Nisaa(4:133)