Well, the Hijri date 11 Shaban 1399 corresponds to the Gregorian date Thursday, 5 July 1979. This date lies in the eighth month of the Hijri year 1399 AH, which is Shaban of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1399/08/11 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 5 July 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Shaban 1399 AH to its equivalent Gregorian date.
خَٰلِدِينَ فِيهِ ۖ وَسَآءَ لَهُمْ يَوْمَ ٱلْقِيَٰمَةِ حِمْلًۭا
Abiding under it - an evil burden for them on the Day of Resurrection,
Surah Taa-Haa(20:101)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
"And say 'Truth (i.e., Islamic Monotheism or this Qur'ān or Jihād against polytheists) has come and Bāṭil (falsehood i.e., Satan or polytheism, etc.) has vanished...'" (V.17:81)
Narrated `Abdullah bin Masud:
Allah's Messenger (ﷺ) entered Mecca (in the year of the Conquest) and there were three-hundred and sixty idols around the Ka`ba. He then started hitting them with a stick in his hand and say: 'Truth (i.e. Islam) has come and falsehood (disbelief) vanished. Truly falsehood (disbelief) is ever bound to vanish.' (17.81) 'Truth has come and falsehood (Iblis) can not create anything.' (34.49)
Sahih al-Bukhari 4720