Well, the Hijri date 18 Rajab 1494 corresponds to the Gregorian date Friday, 14 August 2071. This date lies in the seventh month of the Hijri year 1494 AH, which is Rajab of 1494 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1494/07/18 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.
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The following is the conversion of the Gregorian date 14 August 2071 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Rajab 1494 AH to its equivalent Gregorian date.
يَوْمَ تَرْجُفُ ٱلْأَرْضُ وَٱلْجِبَالُ وَكَانَتِ ٱلْجِبَالُ كَثِيبًۭا مَّهِيلًا
On the day when the earth and the hills rock, and the hills become a heap of running sand.
Surah Al-Muzzammil(73:14)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
"No doubt! They did fold up their breasts, that they may hide from Him. Surely, even when they cover themselves with their garments, He knows what they conceal and what they reveal. Verily, He is the All-Knower of the (innermost secrets) of the breasts." (V.11:5)
Narrated Muhammad bin `Abbas bin Ja`far:
That he heard Ibn `Abbas reciting: "No doubt! They fold up their breasts." (11.5) and asked him about its explanation. He said, "Some people used to hide themselves while answering the call of nature in an open space lest they be exposed to the sky, and also when they had sexual relation with their wives in an open space lest they be exposed to the sky, so the above revelation was sent down regarding them."
Sahih al-Bukhari 4681