Well, the Hijri date 15 Ramadan 1399 corresponds to the Gregorian date Wednesday, 8 August 1979. This date lies in the ninth month of the Hijri year 1399 AH, which is Ramadan of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Wednesday without any doubt. The Arabic date 1399/09/15 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 8 August 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Ramadan 1399 AH to its equivalent Gregorian date.
قَالَ فَإِنَّهَا مُحَرَّمَةٌ عَلَيْهِمْ ۛ أَرْبَعِينَ سَنَةًۭ ۛ يَتِيهُونَ فِى ٱلْأَرْضِ ۚ فَلَا تَأْسَ عَلَى ٱلْقَوْمِ ٱلْفَٰسِقِينَ
(Their Lord) said: For this the land will surely be forbidden them for forty years that they will wander in the earth, bewildered. So grieve not over the wrongdoing folk.
Surah Al-Maaida(5:26)