Well, the Hijri date 20 Dhul Hijjah 1478 corresponds to the Gregorian date Monday, 3 July 2056. This date lies in the twelfth month of the Hijri year 1478 AH, which is Dhu Al-Hijjah of 1478 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1478/12/20 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 3 July 2056 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Dhul Hijjah 1478 AH to its equivalent Gregorian date.
۞ وَٱذْكُرْ أَخَا عَادٍ إِذْ أَنذَرَ قَوْمَهُۥ بِٱلْأَحْقَافِ وَقَدْ خَلَتِ ٱلنُّذُرُ مِنۢ بَيْنِ يَدَيْهِ وَمِنْ خَلْفِهِۦٓ أَلَّا تَعْبُدُوٓا۟ إِلَّا ٱللَّهَ إِنِّىٓ أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ عَظِيمٍۢ
And make mention (O Muhammad) of the brother of A'ad when he warned his folk among the wind-curved sandhills - and verily warners came and went before and after him - saying: Serve none but Allah. Lo! I fear for you the doom of a tremendous Day.
Surah Al-Ahqaf(46:21)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah the Exalted: "That Allah may forgive you your sins of the past and the future and complete His Favour on you and guide you on the Straight Path." (V.48:2)
Narrated Al-Mughira:
The Prophet (ﷺ) used to offer night prayers till his feet became swollen. Somebody said, to him," "Allah has forgiven you, your faults of the past and those to follow." On that, he said, "Shouldn't I be a thankful slave of Allah)?"
Sahih al-Bukhari 4836