Well, the Hijri date 21 Rabi Al Awwal 1399 corresponds to the Gregorian date Sunday, 18 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 Sunday without any doubt. The Arabic date 1399/03/21 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 18 February 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rabi Al Awwal 1399 AH to its equivalent Gregorian date.
وَلَمَّا بَلَغَ أَشُدَّهُۥ وَٱسْتَوَىٰٓ ءَاتَيْنَٰهُ حُكْمًۭا وَعِلْمًۭا ۚ وَكَذَٰلِكَ نَجْزِى ٱلْمُحْسِنِينَ
Surah Al-Qasas(28:14)
Sahih al-Bukhari
Fighting for the Cause of Allah (Jihaad)
Chapter: The superiority of him who carries the luggage of his companions during a journey
Narrated Abu Huraira:
The Prophet (ﷺ) said, "Charity is obligatory everyday on every joint of a human being. If one helps a person in matters concerning his riding animal by helping him to ride it or by lifting his luggage on to it, all this will be regarded charity. A good word, and every step one takes to offer the compulsory Congregational prayer, is regarded as charity; and guiding somebody on the road is regarded as charity."
Sahih al-Bukhari 2891