Well, the Hijri date 1 Jumada Al Akhira 1399 corresponds to the Gregorian date Friday, 27 April 1979. This date lies in the sixth month of the Hijri year 1399 AH, which is Jumada Al-Thani of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Friday without any doubt. The Arabic date 1399/06/01 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 27 April 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 1 Jumada Al Akhira 1399 AH to its equivalent Gregorian date.
ذَٰلِكَ بِأَنَّ ٱللَّهَ هُوَ ٱلْحَقُّ وَأَنَّ مَا يَدْعُونَ مِن دُونِهِۦ هُوَ ٱلْبَٰطِلُ وَأَنَّ ٱللَّهَ هُوَ ٱلْعَلِىُّ ٱلْكَبِيرُ
That is because Allah, He is the True, and that whereon they call instead of Him, it is the false, and because Allah, He is the High, the Great.
Surah Al-Hajj(22:62)
Sahih al-Bukhari
Accepting Information Given by a Truthful Person
Chapter: Acceptance of the information given by one truthful person in about all matters
Narrated Hudhaifa:
The Prophet (ﷺ) said to the people of Najran, "I will send to you an honest person who is really trustworthy." The Companion, of the Prophet (ﷺ) each desired to be that person, but the Prophet (ﷺ) sent Abu 'Ubaida.
Sahih al-Bukhari 7254