Well, the Hijri date 13 Ramadan 1399 corresponds to the Gregorian date Monday, 6 August 1979. This date lies in the ninth month of the Hijri year 1399 AH, which is Ramadan of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1399/09/13 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 6 August 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Ramadan 1399 AH to its equivalent Gregorian date.
إِنَّ ٱلْمُتَّقِينَ فِى مَقَامٍ أَمِينٍۢ
Lo! those who kept their duty will be in a place secured.
Surah Ad-Dukhaan(44:51)
Sahih al-Bukhari
Call to Prayers (Adhaan)
Chapter: Facing of the Imam towards his followers while straightening the rows.
Narrated Anas bin Malik:
Once the Iqama was pronounced and Allah's Messenger (ﷺ) faced us and said, "Straighten your rows and stand closer together, for I see you from behind my back.'
Sahih al-Bukhari 719