Well, the Hijri date 20 Dhul Hijjah 1239 corresponds to the Gregorian date Sunday, 15 August 1824. This date lies in the twelfth month of the Hijri year 1239 AH, which is Dhu Al-Hijjah of 1239 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1239/12/20 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 15 August 1824 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Dhul Hijjah 1239 AH to its equivalent Gregorian date.
وَإِذْ قُلْنَا ٱدْخُلُوا۟ هَٰذِهِ ٱلْقَرْيَةَ فَكُلُوا۟ مِنْهَا حَيْثُ شِئْتُمْ رَغَدًۭا وَٱدْخُلُوا۟ ٱلْبَابَ سُجَّدًۭا وَقُولُوا۟ حِطَّةٌۭ نَّغْفِرْ لَكُمْ خَطَٰيَٰكُمْ ۚ وَسَنَزِيدُ ٱلْمُحْسِنِينَ
And when We said: Go into this township and eat freely of that which is therein, and enter the gate prostrate, and say: "Repentance." We will forgive you your sins and will increase (reward) for the right-doers.
Surah Al-Baqara(2:58)