Well, the Hijri date 30 Rabi Al Thani 1399 corresponds to the Gregorian date Wednesday, 28 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 Wednesday without any doubt. The Arabic date 1399/04/30 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 March 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 30 Rabi Al Thani 1399 AH to its equivalent Gregorian date.
ضَرَبَ ٱللَّهُ مَثَلًۭا لِّلَّذِينَ كَفَرُوا۟ ٱمْرَأَتَ نُوحٍۢ وَٱمْرَأَتَ لُوطٍۢ ۖ كَانَتَا تَحْتَ عَبْدَيْنِ مِنْ عِبَادِنَا صَٰلِحَيْنِ فَخَانَتَاهُمَا فَلَمْ يُغْنِيَا عَنْهُمَا مِنَ ٱللَّهِ شَيْـًۭٔا وَقِيلَ ٱدْخُلَا ٱلنَّارَ مَعَ ٱلدَّٰخِلِينَ
Allah citeth an example for those who disbelieve: the wife of Noah and the wife of Lot, who were under two of Our righteous slaves yet betrayed them so that they (the husbands) availed them naught against Allah and it was said (unto them): Enter the Fire along with those who enter.
Surah At-Tahrim(66:10)