Well, the Hijri date 15 Dhul Hijjah 1439 corresponds to the Gregorian date Sunday, 26 August 2018. This date lies in the twelfth month of the Hijri year 1439 AH, which is Dhu Al-Hijjah of 1439 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1439/12/15 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 26 August 2018 to its equivalent Arabic date.
The following is the conversion of the Arabic date 15 Dhul Hijjah 1439 AH to its equivalent Gregorian date.
لِّيُدْخِلَ ٱلْمُؤْمِنِينَ وَٱلْمُؤْمِنَٰتِ جَنَّٰتٍۢ تَجْرِى مِن تَحْتِهَا ٱلْأَنْهَٰرُ خَٰلِدِينَ فِيهَا وَيُكَفِّرَ عَنْهُمْ سَيِّـَٔاتِهِمْ ۚ وَكَانَ ذَٰلِكَ عِندَ ٱللَّهِ فَوْزًا عَظِيمًۭا
That He may bring the believing men and the believing women into Gardens underneath which rivers flow, wherein they will abide, and may remit from them their evil deeds - That, in the sight of Allah, is the supreme triumph -
Surah Al-Fath(48:5)
Sahih al-Bukhari
Hajj (Pilgrimage)
Chapter: Reciting Talbiya while facing the Qiblah
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Narrated Nafi', 'Whenever Ibn 'Umar finished his morning Salat at Dhul-Hulaifa he would get his Rahila (mount) prepared. Then, he would ride on it, and after it had stood up straight (ready to set out), he would face Al-Qiblah (the Ka,bah at Makkah) while sitting (on his mount) and recite Talbiya. When he had reached the boundaries of the Haram (or Makkah), he would stop recitation of Talbiya till he reached Dhi-Tuwa (near Makkah) where he would pass the night till it was dawn. After offering the morning Salat, he would take a bath. He claimed that Allah's Messenger (ﷺ) had done the same.
Sahih al-Bukhari 1553