Well, the Hijri date 20 Rajab 1399 corresponds to the Gregorian date Friday, 15 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 Friday without any doubt. The Arabic date 1399/07/20 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 15 June 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rajab 1399 AH to its equivalent Gregorian date.
أَمْ يَقُولُونَ تَقَوَّلَهُۥ ۚ بَل لَّا يُؤْمِنُونَ
Or say they: He hath invented it? Nay, but they will not believe!
Surah At-Tur(52:33)
Sahih al-Bukhari
Fighting for the Cause of Allah (Jihaad)
Chapter: The participation of a woman in a sea battle
Narrated Anas:
Allah's Messenger (ﷺ) went to the daughter of Milhan and reclined there (and slept) and then (woke up) smiling. She asked, "O Allah's Messenger (ﷺ)! What makes you smile?" He replied, (I dreamt that) some people amongst my followers were sailing on the green sea in Allah's Cause, resembling kings on thrones." She said, "O Allah's Messenger (ﷺ)! Invoke Allah to make me one of them." He said, "O Allah! Let her be one of them." Then he (slept again and woke up and) smiled. She asked him the same question and he gave the same reply. She said, "Invoke Allah to make me one of them." He replied, ''You will be amongst the first group of them; you will not be amongst the last." Later on she married 'Ubada bin As-Samit and then she sailed on the sea with bint Qaraza, Mu'awiya's wife (for Jihad). On her return, she mounted her riding animal, which threw her down breaking her neck, and she died on falling down.
Sahih al-Bukhari 2877