Well, the Hijri date 28 Rabi Al Thani 1399 corresponds to the Gregorian date Monday, 26 March 1979. This date lies in the fourth month of the Hijri year 1399 AH, which is Rabi Al-Thani of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1399/04/28 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 26 March 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 28 Rabi Al Thani 1399 AH to its equivalent Gregorian date.
ٱلَّذِينَ يَجْعَلُونَ مَعَ ٱللَّهِ إِلَٰهًا ءَاخَرَ ۚ فَسَوْفَ يَعْلَمُونَ
Who set some other god along with Allah. But they will come to know.
Surah Al-Hijr(15:96)