Well, the Hijri date 18 Dhul Qidah 1391 corresponds to the Gregorian date Tuesday, 4 January 1972. This date lies in the eleventh month of the Hijri year 1391 AH, which is Dhu Al-Qidah of 1391 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1391/11/18 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 4 January 1972 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Dhul Qidah 1391 AH to its equivalent Gregorian date.
كُنتُمْ خَيْرَ أُمَّةٍ أُخْرِجَتْ لِلنَّاسِ تَأْمُرُونَ بِٱلْمَعْرُوفِ وَتَنْهَوْنَ عَنِ ٱلْمُنكَرِ وَتُؤْمِنُونَ بِٱللَّهِ ۗ وَلَوْ ءَامَنَ أَهْلُ ٱلْكِتَٰبِ لَكَانَ خَيْرًۭا لَّهُم ۚ مِّنْهُمُ ٱلْمُؤْمِنُونَ وَأَكْثَرُهُمُ ٱلْفَٰسِقُونَ
Ye are the best community that hath been raised up for mankind. Ye enjoin right conduct and forbid indecency; and ye believe in Allah. And if the People of the Scripture had believed it had been better for them. Some of them are believers; but most of them are evil-livers.
Surah Aal-i-Imraan(3:110)