Well, the Hijri date 11 Dhul Hijjah 1406 corresponds to the Gregorian date Saturday, 16 August 1986. This date lies in the twelfth month of the Hijri year 1406 AH, which is Dhu Al-Hijjah of 1406 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1406/12/11 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 16 August 1986 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Dhul Hijjah 1406 AH to its equivalent Gregorian date.
وَلَقَدْ أَرْسَلْنَا نُوحًا إِلَىٰ قَوْمِهِۦٓ إِنِّى لَكُمْ نَذِيرٌۭ مُّبِينٌ
And We sent Noah unto his folk (and he said): Lo! I am a plain warner unto you.
Surah Hud(11:25)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah the Most High: "...When they gave their Bai'a (pledge) to you (O Muḥammad pbuh) under the tree..." (V.48:18)
Narrated Thabit bin Ad-Dahhak:
who was one of the companions of the tree (those who swore allegiance to the Prophet (ﷺ) beneath the tree at Al-Hudaibiya):
Sahih al-Bukhari 4843