Well, the Hijri date 30 Shawwal 1388 corresponds to the Gregorian date Saturday, 18 January 1969. This date lies in the tenth month of the Hijri year 1388 AH, which is Shawwal of 1388 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1388/10/30 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 18 January 1969 to its equivalent Arabic date.
The following is the conversion of the Arabic date 30 Shawwal 1388 AH to its equivalent Gregorian date.
وَلَقَدْ جَآءَهُمْ رَسُولٌۭ مِّنْهُمْ فَكَذَّبُوهُ فَأَخَذَهُمُ ٱلْعَذَابُ وَهُمْ ظَٰلِمُونَ
And verily there had come unto them a messenger from among them, but they had denied him, and so the torment seized them while they were wrong-doers.
Surah An-Nahl(16:113)