Well, the Hijri date 18 Rabi Al Awwal 1399 corresponds to the Gregorian date Thursday, 15 February 1979. This date lies in the third month of the Hijri year 1399 AH, which is Rabi Al-Awwal of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1399/03/18 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 15 February 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Rabi Al Awwal 1399 AH to its equivalent Gregorian date.
سَلْ بَنِىٓ إِسْرَٰٓءِيلَ كَمْ ءَاتَيْنَٰهُم مِّنْ ءَايَةٍۭ بَيِّنَةٍۢ ۗ وَمَن يُبَدِّلْ نِعْمَةَ ٱللَّهِ مِنۢ بَعْدِ مَا جَآءَتْهُ فَإِنَّ ٱللَّهَ شَدِيدُ ٱلْعِقَابِ
Ask of the Children of Israel how many a clear revelation We gave them! He who altereth the grace of Allah after it hath come unto him (for him), lo! Allah is severe in punishment.
Surah Al-Baqara(2:211)
