Well, the Hijri date 5 Rajab 1400 corresponds to the Gregorian date Monday, 19 May 1980. This date lies in the seventh month of the Hijri year 1400 AH, which is Rajab of 1400 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1400/07/05 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 19 May 1980 to its equivalent Arabic date.
The following is the conversion of the Arabic date 5 Rajab 1400 AH to its equivalent Gregorian date.
لَوْ يَعْلَمُ ٱلَّذِينَ كَفَرُوا۟ حِينَ لَا يَكُفُّونَ عَن وُجُوهِهِمُ ٱلنَّارَ وَلَا عَن ظُهُورِهِمْ وَلَا هُمْ يُنصَرُونَ
If those who disbelieved but knew the time when they will not be able to drive off the fire from their faces and from their backs, and they will not be helped!
Surah Al-Anbiyaa(21:39)