Well, the Hijri date 8 Shawwal 1400 corresponds to the Gregorian date Monday, 18 August 1980. This date lies in the tenth month of the Hijri year 1400 AH, which is Shawwal of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1400/10/08 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 18 August 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 8 Shawwal 1400 AH to its equivalent Gregorian date.
وَإِن نَّكَثُوٓا۟ أَيْمَٰنَهُم مِّنۢ بَعْدِ عَهْدِهِمْ وَطَعَنُوا۟ فِى دِينِكُمْ فَقَٰتِلُوٓا۟ أَئِمَّةَ ٱلْكُفْرِ ۙ إِنَّهُمْ لَآ أَيْمَٰنَ لَهُمْ لَعَلَّهُمْ يَنتَهُونَ
And if they break their pledges after their treaty (hath been made with you) and assail your religion, then fight the heads of disbelief - Lo! they have no binding oaths - in order that they may desist.
Surah At-Tawba(9:12)
Sahih al-Bukhari
Knowledge
Chapter: To travel seeking an answer to a problematic matter, and to teach it to one's family
Narrated `Abdullah bin Abi Mulaika:
`Uqba bin Al-Harith said that he had married the daughter of Abi Ihab bin `Aziz. Later on a woman came to him and said, "I have suckled (nursed) `Uqba and the woman whom he married (his wife) at my breast." `Uqba said to her, "Neither I knew that you have suckled (nursed) me nor did you tell me." Then he rode over to see Allah's Messenger (ﷺ) at Medina, and asked him about it. Allah's Messenger (ﷺ) said, "How can you keep her as a wife when it has been said (that she is your foster-sister)?" Then `Uqba divorced her, and she married another man.
Sahih al-Bukhari 88