Well, the Hijri date 20 Dhul Hijjah 1403 corresponds to the Gregorian date Tuesday, 27 September 1983. This date lies in the twelfth month of the Hijri year 1403 AH, which is Dhu Al-Hijjah of 1403 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1403/12/20 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 27 September 1983 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Dhul Hijjah 1403 AH to its equivalent Gregorian date.
۞ نَبِّئْ عِبَادِىٓ أَنِّىٓ أَنَا ٱلْغَفُورُ ٱلرَّحِيمُ
Surah Al-Hijr(15:49)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
The Statement of Allah the Most High: "And magnify your Lord (Allah)!" (V.74:3)
Narrated Yahya:
I asked Aba Salama, "Which Sura of the Qur'an was revealed first?" He replied, "O you, wrapped-up' (Al-Muddaththir)." I said, "I have been informed that it was, 'Read, in the Name of your Lord who created (i.e. Surat Al-Alaq)...similar to the narration related by `Ali bin Al-Mubarak, 444 above).
Sahih al-Bukhari 4924