Well, the Hijri date 26 Ramadan 1399 corresponds to the Gregorian date Sunday, 19 August 1979. This date lies in the ninth month of the Hijri year 1399 AH, which is Ramadan of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1399/09/26 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 19 August 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 26 Ramadan 1399 AH to its equivalent Gregorian date.
تُدَمِّرُ كُلَّ شَىْءٍۭ بِأَمْرِ رَبِّهَا فَأَصْبَحُوا۟ لَا يُرَىٰٓ إِلَّا مَسَٰكِنُهُمْ ۚ كَذَٰلِكَ نَجْزِى ٱلْقَوْمَ ٱلْمُجْرِمِينَ
Destroying all things by commandment of its Lord. And morning found them so that naught could be seen save their dwellings. Thus do We reward the guilty folk.
Surah Al-Ahqaf(46:25)
Sahih al-Bukhari
Manumission of Slaves
Chapter: Whoever possessed Arab slaves
Narrated Abu Huraira:
I have loved the people of the tribe of Bani Tamim ever since I heard, three things, Allah's Messenger (ﷺ) said about them. I heard him saying, These people (of the tribe of Bani Tamim) would stand firm against Ad-Dajjal." When the Sadaqat (gifts of charity) from that tribe came, Allah's Messenger (ﷺ) said, "These are the Sadaqat (i.e. charitable gifts) of our folk." `Aisha had a slave-girl from that tribe, and the Prophet (ﷺ) said to `Aisha, "Manumit her as she is a descendant of Ishmael (the Prophet).
Sahih al-Bukhari 2543