Well, the Hijri date 1 Rajab 1399 corresponds to the Gregorian date Sunday, 27 May 1979. This date lies in the seventh month of the Hijri year 1399 AH, which is Rajab of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1399/07/01 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 May 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Rajab 1399 AH to its equivalent Gregorian date.
إِنَّ ٱلَّذِينَ لَا يُؤْمِنُونَ بِٱلْءَاخِرَةِ زَيَّنَّا لَهُمْ أَعْمَٰلَهُمْ فَهُمْ يَعْمَهُونَ
Lo! as for those who believe not in the Hereafter, We have made their works fairseeming unto them so that they are all astray.
Surah An-Naml(27:4)