Well, the Hijri date 6 Jumada Al Oula 1398 corresponds to the Gregorian date Thursday, 13 April 1978. This date lies in the fifth month of the Hijri year 1398 AH, which is Jumada Al-Awwal of 1398 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1398/05/06 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 13 April 1978 to its equivalent Arabic date.
The following is the conversion of the Arabic date 6 Jumada Al Oula 1398 AH to its equivalent Gregorian date.
ٱلَّذِينَ قَالَ لَهُمُ ٱلنَّاسُ إِنَّ ٱلنَّاسَ قَدْ جَمَعُوا۟ لَكُمْ فَٱخْشَوْهُمْ فَزَادَهُمْ إِيمَٰنًۭا وَقَالُوا۟ حَسْبُنَا ٱللَّهُ وَنِعْمَ ٱلْوَكِيلُ
Those unto whom men said: Lo! the people have gathered against you, therefor fear them. (The threat of danger) but increased the faith of them and they cried: Allah is Sufficient for us! Most Excellent is He in Whom we trust!
Surah Aal-i-Imraan(3:173)