Well, the Hijri date 6 Shawwal 1399 corresponds to the Gregorian date Tuesday, 28 August 1979. This date lies in the tenth month of the Hijri year 1399 AH, which is Shawwal of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1399/10/06 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 28 August 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 6 Shawwal 1399 AH to its equivalent Gregorian date.
وَهُوَ ٱللَّهُ لَآ إِلَٰهَ إِلَّا هُوَ ۖ لَهُ ٱلْحَمْدُ فِى ٱلْأُولَىٰ وَٱلْءَاخِرَةِ ۖ وَلَهُ ٱلْحُكْمُ وَإِلَيْهِ تُرْجَعُونَ
And He is Allah; there is no Allah save Him. His is all praise in the former and the latter (state), and His is the command, and unto Him ye will be brought back.
Surah Al-Qasas(28:70)