Well, the Hijri date 13 Rajab 1401 corresponds to the Gregorian date Sunday, 17 May 1981. This date lies in the seventh month of the Hijri year 1401 AH, which is Rajab of 1401 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1401/07/13 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 17 May 1981 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Rajab 1401 AH to its equivalent Gregorian date.
وَكَانَ لَهُۥ ثَمَرٌۭ فَقَالَ لِصَٰحِبِهِۦ وَهُوَ يُحَاوِرُهُۥٓ أَنَا۠ أَكْثَرُ مِنكَ مَالًۭا وَأَعَزُّ نَفَرًۭا
And he had fruit. And he said unto his comrade, when he spake with him: I am more than thee in wealth, and stronger in respect of men.
Surah Al-Kahf(18:34)
Sahih al-Bukhari
Prophets
Chapter: The Statement of Allah Taa'la: "And mention in the Book, the story of Maryam..."
Narrated Abu Huraira:
I heard Allah's Messenger (ﷺ) saying, "I am the nearest of all the people to the son of Mary, and all the prophets are paternal brothers, and there has been no prophet between me and him (i.e. Jesus).
Sahih al-Bukhari 3442