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.
وَيْلٌۭ يَوْمَئِذٍۢ لِّلْمُكَذِّبِينَ
Woe unto the repudiators on that day!
Surah Al-Mursalaat(77:19)
Sahih al-Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Chapter: Asking Allah with His Names and seeking refuge with them
Narrated `Adi bin Hatim:
I asked the Prophet, "I send off (for a game) my trained hunting dogs; (what is your verdict concerning the game they hunt?" He said, "If you send off your trained hunting dogs and mention the Name of Allah, then, if they catch some game, eat (thereof). And if you hit the game with a mi'rad (a hunting tool) and it wounds it, you can eat (it).
Sahih al-Bukhari 7397