Well, the Hijri date 26 Shawwal 1399 corresponds to the Gregorian date Monday, 17 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 1399/10/26 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 17 September 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Shawwal 1399 AH to its equivalent Gregorian date.
مَا كَانَ لِلْمُشْرِكِينَ أَن يَعْمُرُوا۟ مَسَٰجِدَ ٱللَّهِ شَٰهِدِينَ عَلَىٰٓ أَنفُسِهِم بِٱلْكُفْرِ ۚ أُو۟لَٰٓئِكَ حَبِطَتْ أَعْمَٰلُهُمْ وَفِى ٱلنَّارِ هُمْ خَٰلِدُونَ
It is not for the idolaters to tend Allah's sanctuaries, bearing witness against themselves of disbelief. As for such, their works are vain and in the Fire they will abide.
Surah At-Tawba(9:17)
Sahih al-Bukhari
Judgments (Ahkaam)
Chapter: To forbid the criminals and sinners to talk to or visit the ruler
Narrated `Abdullah bin Ka`b bin Malik:
Who was Ka`b's guide from among his sons when Ka`b became blind: I heard Ka`b bin Malik saying, "When some people remained behind and did not join Allah's Messenger (ﷺ) in the battle of Tabuk.." and then he described the whole narration and said, "Allah's Messenger (ﷺ) forbade the Muslims to speak to us, and so we (I and my companions) stayed fifty nights in that state, and then Allah's Messenger (ﷺ) announced Allah's acceptance of our repentance."
Sahih al-Bukhari 7225