Well, the Hijri date 2 Dhul Qidah 1399 corresponds to the Gregorian date Sunday, 23 September 1979. This date lies in the eleventh month of the Hijri year 1399 AH, which is Dhu Al-Qidah of 1399 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1399/11/02 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 23 September 1979 to its equivalent Arabic date.
The following is the conversion of the Arabic date 2 Dhul Qidah 1399 AH to its equivalent Gregorian date.
ثُمَّ بَعَثْنَٰكُم مِّنۢ بَعْدِ مَوْتِكُمْ لَعَلَّكُمْ تَشْكُرُونَ
Then We revived you after your extinction, that ye might give thanks.
Surah Al-Baqara(2:56)
Sahih al-Bukhari
Oaths and Vows
Chapter: If somebody dies without fulfiling a vow
Narrated Sa`id bin 'Ubada Al-Ansari:
that he consulted the Prophet (ﷺ) about a vow that had been made by his mother who died without fulfilling it. The Prophet (ﷺ) gave his verdict that he should fulfill it on her behalf. The verdict became Sunna (i.e. the Prophet's tradition).
Sahih al-Bukhari 6698