Well, the Hijri date 9 Dhul Hijjah 1399 corresponds to the Gregorian date Tuesday, 30 October 1979. This date lies in the twelfth month of the Hijri year 1399 AH, which is Dhu Al-Hijjah of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1399/12/09 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 30 October 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 9 Dhul Hijjah 1399 AH to its equivalent Gregorian date.
وَهُمْ يَصْطَرِخُونَ فِيهَا رَبَّنَآ أَخْرِجْنَا نَعْمَلْ صَٰلِحًا غَيْرَ ٱلَّذِى كُنَّا نَعْمَلُ ۚ أَوَلَمْ نُعَمِّرْكُم مَّا يَتَذَكَّرُ فِيهِ مَن تَذَكَّرَ وَجَآءَكُمُ ٱلنَّذِيرُ ۖ فَذُوقُوا۟ فَمَا لِلظَّٰلِمِينَ مِن نَّصِيرٍ
And they cry for help there, (saying): Our Lord! Release us; we will do right, not (the wrong) that we used to do. Did not We grant you a life long enough for him who reflected to reflect therein? And the warner came unto you. Now taste (the flavour of your deeds), for evil-doers have no helper.
Surah Faatir(35:37)
Sahih al-Bukhari
Prayers (Salat)
Chapter: What has been said about (facing) the Qiblah (Kabah at Makkah) and wherever considered that there was no need to repeat the Salat (prayer) if someone offered prayers by mistake facing a direction other than that of the Qiblah
Narrated `Abdullah bin `Umar:
While the people were offering the Fajr prayer at Quba' (near Medina), someone came to them and said: "It has been revealed to Allah's Messenger (ﷺ) tonight, and he has been ordered to pray facing the Ka`ba." So turn your faces to the Ka`ba. Those people were facing Sham (Jerusalem) so they turned their faces towards Ka`ba (at Mecca).
Sahih al-Bukhari 403