Well, the Hijri date 29 Rajab 1398 corresponds to the Gregorian date Tuesday, 4 July 1978. This date lies in the seventh month of the Hijri year 1398 AH, which is Rajab of 1398 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1398/07/29 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 4 July 1978 to its equivalent Arabic date.
The following is the conversion of the Arabic date 29 Rajab 1398 AH to its equivalent Gregorian date.
وَمَا كَانَ لِنَبِىٍّ أَن يَغُلَّ ۚ وَمَن يَغْلُلْ يَأْتِ بِمَا غَلَّ يَوْمَ ٱلْقِيَٰمَةِ ۚ ثُمَّ تُوَفَّىٰ كُلُّ نَفْسٍۢ مَّا كَسَبَتْ وَهُمْ لَا يُظْلَمُونَ
It is not for any prophet to embezzle. Whoso embezzleth will bring what he embezzled with him on the Day of Resurrection. Then every soul will be paid in full what it hath earned; and they will not be wronged.
Surah Aal-i-Imraan(3:161)