Well, the Hijri date 21 Rajab 1399 corresponds to the Gregorian date Saturday, 16 June 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 Saturday without any doubt. The Arabic date 1399/07/21 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 16 June 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Rajab 1399 AH to its equivalent Gregorian date.
يَٰبَنِىٓ إِسْرَٰٓءِيلَ ٱذْكُرُوا۟ نِعْمَتِىَ ٱلَّتِىٓ أَنْعَمْتُ عَلَيْكُمْ وَأَنِّى فَضَّلْتُكُمْ عَلَى ٱلْعَٰلَمِينَ
O Children of Israel! Remember My favour wherewith I favoured you and how I preferred you to (all) creatures.
Surah Al-Baqara(2:122)
Sahih al-Bukhari
Sales and Trade
Chapter: Selling of barley for barley
Narrated Ibn Shihab:
that Malik bin Aus said, "I was in need of change for one-hundred Dinars. Talha bin 'Ubaidullah called me and we discussed the matter, and he agreed to change (my Dinars). He took the gold pieces in his hands and fidgeted with them, and then said, "Wait till my storekeeper comes from the forest." `Umar was listening to that and said, "By Allah! You should not separate from Talha till you get the money from him, for Allah's Messenger (ﷺ) said, 'The selling of gold for gold is Riba (usury) except if the exchange is from hand to hand and equal in amount, and similarly, the selling of wheat for wheat is Riba (usury) unless it is from hand to hand and equal in amount, and the selling of barley for barley is usury unless it is from hand to hand and equal in amount, and dates for dates, is usury unless it is from hand to hand and equal in amount"
Sahih al-Bukhari 2174