Well, the Hijri date 4 Shawwal 1399 corresponds to the Gregorian date Sunday, 26 August 1979. This date lies in the tenth month of the Hijri year 1399 AH, which is Shawwal of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1399/10/04 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 26 August 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 4 Shawwal 1399 AH to its equivalent Gregorian date.
فَكَيْفَ إِذَا تَوَفَّتْهُمُ ٱلْمَلَٰٓئِكَةُ يَضْرِبُونَ وُجُوهَهُمْ وَأَدْبَٰرَهُمْ
Then how (will it be with them) when the angels gather them, smiting their faces and their backs!
Surah Muhammad(47:27)
Sahih al-Bukhari
Sales and Trade
Chapter: The option of cancelling the bargain
Narrated Ibn `Umar:
Allah's Messenger (ﷺ) said, "Both the buyer and the seller have the option of canceling or confirming the bargain, as long as they are still together; and unless they separate or one of them gives the other the option of keeping or returning the things and a decision is concluded then, in which case the bargain is considered final. If they separate after the bargain and none of them has rejected it, then the bargain is rendered final."
Sahih al-Bukhari 2112