Well, the Hijri date 11 Dhul Qidah 1398 corresponds to the Gregorian date Friday, 13 October 1978. This date lies in the eleventh month of the Hijri year 1398 AH, which is Dhu Al-Qidah of 1398 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1398/11/11 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.
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The following is the conversion of the Gregorian date 13 October 1978 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Dhul Qidah 1398 AH to its equivalent Gregorian date.
فَكَانَ قَابَ قَوْسَيْنِ أَوْ أَدْنَىٰ
Till he was (distant) two bows' length or even nearer,
Surah An-Najm(53:9)