Well, the Hijri date 14 Rajab 1399 corresponds to the Gregorian date Saturday, 9 June 1979. This date lies in the seventh month of the Hijri year 1399 AH, which is Rajab of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Saturday without any doubt. The Arabic date 1399/07/14 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 9 June 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 14 Rajab 1399 AH to its equivalent Gregorian date.
هُوَ ٱلَّذِى خَلَقَ لَكُم مَّا فِى ٱلْأَرْضِ جَمِيعًۭا ثُمَّ ٱسْتَوَىٰٓ إِلَى ٱلسَّمَآءِ فَسَوَّىٰهُنَّ سَبْعَ سَمَٰوَٰتٍۢ ۚ وَهُوَ بِكُلِّ شَىْءٍ عَلِيمٌۭ
He it is Who created for you all that is in the earth. Then turned He to the heaven, and fashioned it as seven heavens. And He is knower of all things.
Surah Al-Baqara(2:29)
Sahih al-Bukhari
Wills and Testaments (Wasaayaa)
Chapter: Charity on behalf of a person who dies suddenly. And the execution of the vows.
Narrated Ibn `Abbas:
Sa`d bin Ubada consulted Allah's Messenger (ﷺ) saying, "My mother died and she had an unfulfilled vow." The Prophet (ﷺ) said, "Fulfill it on her behalf."
Sahih al-Bukhari 2761