Well, the Hijri date 13 Safar 1379 corresponds to the Gregorian date Monday, 17 August 1959. This date lies in the second month of the Hijri year 1379 AH, which is Safar of 1379 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1379/02/13 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 17 August 1959 to its equivalent Arabic date.
The following is the conversion of the Arabic date 13 Safar 1379 AH to its equivalent Gregorian date.
وَإِذَا قِيلَ إِنَّ وَعْدَ ٱللَّهِ حَقٌّۭ وَٱلسَّاعَةُ لَا رَيْبَ فِيهَا قُلْتُم مَّا نَدْرِى مَا ٱلسَّاعَةُ إِن نَّظُنُّ إِلَّا ظَنًّۭا وَمَا نَحْنُ بِمُسْتَيْقِنِينَ
And when it was said: Lo! Allah's promise is the truth, and there is no doubt of the Hour's coming, ye said: We know not what the Hour is. We deem it naught but a conjecture, and we are by no means convinced.
Surah Al-Jaathiya(45:32)
Sahih al-Bukhari
Friday Prayer
Chapter: Saying "Ammaba'du" in the Khutba
Narrated Al-Miswar bin Makhrama:
Once Allah's Messenger (ﷺ) got up for delivering the Khutba and I heard him after "Tashah-hud" saying "Amma ba'du."
Sahih al-Bukhari 926