Well, the Hijri date 1 Rabi Al Thani 1399 corresponds to the Gregorian date Tuesday, 27 February 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 Tuesday without any doubt. The Arabic date 1399/04/01 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 27 February 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Rabi Al Thani 1399 AH to its equivalent Gregorian date.
بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ لَا تُقَدِّمُوا۟ بَيْنَ يَدَىِ ٱللَّهِ وَرَسُولِهِۦ ۖ وَٱتَّقُوا۟ ٱللَّهَ ۚ إِنَّ ٱللَّهَ سَمِيعٌ عَلِيمٌۭ
Surah Al-Hujuraat(49:1)
Sahih al-Bukhari
Jizyah and Mawaada'ah
Chapter: The sin of a betrayer
Narrated Ibn `Umar:
The Prophet (ﷺ) said, "Every betrayer will have a flag which will be fixed on the Day of Resurrection, and the flag's prominence will be made in order to show the betrayal he committed."
Sahih al-Bukhari 3188