Well, the Hijri date 18 Dhul Hijjah 1400 corresponds to the Gregorian date Monday, 27 October 1980. This date lies in the twelfth month of the Hijri year 1400 AH, which is Dhu Al-Hijjah of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1400/12/18 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 27 October 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Dhul Hijjah 1400 AH to its equivalent Gregorian date.
فَأَكَلَا مِنْهَا فَبَدَتْ لَهُمَا سَوْءَٰتُهُمَا وَطَفِقَا يَخْصِفَانِ عَلَيْهِمَا مِن وَرَقِ ٱلْجَنَّةِ ۚ وَعَصَىٰٓ ءَادَمُ رَبَّهُۥ فَغَوَىٰ
Then they twain ate thereof, so that their shame became apparent unto them, and they began to hide by heaping on themselves some of the leaves of the Garden. And Adam disobeyed his Lord, so went astray.
Surah Taa-Haa(20:121)