Well, the Hijri date 16 Shawwal 1390 corresponds to the Gregorian date Monday, 14 December 1970. This date lies in the tenth month of the Hijri year 1390 AH, which is Shawwal of 1390 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1390/10/16 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 14 December 1970 to its equivalent Arabic date.
The following is the conversion of the Arabic date 16 Shawwal 1390 AH to its equivalent Gregorian date.
إِنَّ فِى ذَٰلِكَ لَءَايَٰتٍۢ لِّلْمُتَوَسِّمِينَ
Lo! therein verily are portents for those who read the signs.
Surah Al-Hijr(15:75)