Well, the Hijri date 12 Shawwal 1399 corresponds to the Gregorian date Monday, 3 September 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 Monday without any doubt. The Arabic date 1399/10/12 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 3 September 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Shawwal 1399 AH to its equivalent Gregorian date.
إِنَّمَا حَرَّمَ عَلَيْكُمُ ٱلْمَيْتَةَ وَٱلدَّمَ وَلَحْمَ ٱلْخِنزِيرِ وَمَآ أُهِلَّ بِهِۦ لِغَيْرِ ٱللَّهِ ۖ فَمَنِ ٱضْطُرَّ غَيْرَ بَاغٍۢ وَلَا عَادٍۢ فَلَآ إِثْمَ عَلَيْهِ ۚ إِنَّ ٱللَّهَ غَفُورٌۭ رَّحِيمٌ
He hath forbidden you only carrion, and blood, and swineflesh, and that which hath been immolated to (the name of) any other than Allah. But he who is driven by necessity, neither craving nor transgressing, it is no sin for him. Lo! Allah is Forgiving, Merciful.
Surah Al-Baqara(2:173)
Sahih al-Bukhari
Peacemaking
Chapter: Reconciliation in case of dispute concerning debts
Narrated `Abdullah bin Ka`b:
That Ka`b bin Malik told him that in the lifetime of Allah's Messenger (ﷺ) he demanded his debt from Ibn Abu Hadrad in the Mosque. Their voices grew louder till Allah's Messenger (ﷺ) heard them while he was in his house. So he lifted the curtain of his room and called Ka`b bin Malik saying, "O Ka`b!" He replied, "Labbaik! O Allah's Messenger (ﷺ)!" He beckoned to him with his hand suggesting that he deduct half the debt. Ka`b said, "I agree, O Allah's Messenger (ﷺ)!" Allah's Messenger (ﷺ) then said (to Ibn Abu Hadrad), "Get up and pay him the rest."
Sahih al-Bukhari 2710