Well, the Hijri date 16 Dhul Hijjah 1390 corresponds to the Gregorian date Thursday, 11 February 1971. This date lies in the twelfth month of the Hijri year 1390 AH, which is Dhu Al-Hijjah of 1390 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1390/12/16 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 11 February 1971 to its equivalent Arabic date.
The following is the conversion of the Arabic date 16 Dhul Hijjah 1390 AH to its equivalent Gregorian date.
أَوَلَمْ يَتَفَكَّرُوا۟ ۗ مَا بِصَاحِبِهِم مِّن جِنَّةٍ ۚ إِنْ هُوَ إِلَّا نَذِيرٌۭ مُّبِينٌ
Have they not bethought them (that) there is no madness in their comrade? He is but a plain warner.
Surah Al-A'raaf(7:184)