Well, the Hijri date 18 Jumada Al Oula 1399 corresponds to the Gregorian date Sunday, 15 April 1979. This date lies in the fifth month of the Hijri year 1399 AH, which is Jumada Al-Awwal of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1399/05/18 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 April 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 18 Jumada Al Oula 1399 AH to its equivalent Gregorian date.
وَسَلَٰمٌ عَلَيْهِ يَوْمَ وُلِدَ وَيَوْمَ يَمُوتُ وَيَوْمَ يُبْعَثُ حَيًّۭا
Peace on him the day he was born, and the day he dieth and the day he shall be raised alive!
Surah Maryam(19:15)
Sahih al-Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Chapter
Narrated Mahmud bin Ar-Rabi:
That `Itban bin Malik who was one of the companions of the Prophet (ﷺ) and one of the warriors of Badr, came to Allah's Messenger (ﷺ).
Sahih al-Bukhari 4009