Well, the Hijri date 21 Rabi Al Awwal 1400 corresponds to the Gregorian date Thursday, 7 February 1980. This date lies in the third month of the Hijri year 1400 AH, which is Rabi Al-Awwal of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1400/03/21 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 7 February 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Awwal 1400 AH to its equivalent Gregorian date.
إِنَّنِىٓ أَنَا ٱللَّهُ لَآ إِلَٰهَ إِلَّآ أَنَا۠ فَٱعْبُدْنِى وَأَقِمِ ٱلصَّلَوٰةَ لِذِكْرِىٓ
Lo! I, even I, am Allah, There is no Allah save Me. So serve Me and establish worship for My remembrance.
Surah Taa-Haa(20:14)