Well, the Hijri date 18 Dhul Qidah 1387 corresponds to the Gregorian date Friday, 16 February 1968. This date lies in the eleventh month of the Hijri year 1387 AH, which is Dhu Al-Qidah of 1387 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1387/11/18 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 16 February 1968 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Dhul Qidah 1387 AH to its equivalent Gregorian date.
۞ وَإِذَا مَسَّ ٱلْإِنسَٰنَ ضُرٌّۭ دَعَا رَبَّهُۥ مُنِيبًا إِلَيْهِ ثُمَّ إِذَا خَوَّلَهُۥ نِعْمَةًۭ مِّنْهُ نَسِىَ مَا كَانَ يَدْعُوٓا۟ إِلَيْهِ مِن قَبْلُ وَجَعَلَ لِلَّهِ أَندَادًۭا لِّيُضِلَّ عَن سَبِيلِهِۦ ۚ قُلْ تَمَتَّعْ بِكُفْرِكَ قَلِيلًا ۖ إِنَّكَ مِنْ أَصْحَٰبِ ٱلنَّارِ
And when some hurt toucheth man, he crieth unto his Lord, turning unto Him (repentant). Then, when He granteth him a boon from Him he forgetteth that for which he cried unto Him before, and setteth up rivals to Allah that he may beguile (men) from his way. Say (O Muhammad, unto such an one): Take pleasure in thy disbelief a while. Lo! thou art of the owners of the Fire.
Surah Az-Zumar(39:8)