Well, the Hijri date 20 Dhul Hijjah 1413 corresponds to the Gregorian date Thursday, 10 June 1993. This date lies in the twelfth month of the Hijri year 1413 AH, which is Dhu Al-Hijjah of 1413 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1413/12/20 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 10 June 1993 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Dhul Hijjah 1413 AH to its equivalent Gregorian date.
ذَٰلِكَ بِأَنَّ ٱللَّهَ نَزَّلَ ٱلْكِتَٰبَ بِٱلْحَقِّ ۗ وَإِنَّ ٱلَّذِينَ ٱخْتَلَفُوا۟ فِى ٱلْكِتَٰبِ لَفِى شِقَاقٍۭ بَعِيدٍۢ
That is because Allah hath revealed the Scripture with the truth. Lo! those who find (a cause of) disagreement in the Scripture are in open schism.
Surah Al-Baqara(2:176)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Allah's Statement: "This day, I have perfected your religion for you..." (V.5:3)
Narrated Tariq bin Shihab:
The Jews said to `Umar, "You (i.e. Muslims) recite a Verse, and had it been revealed to us, we would have taken the day of its revelation as a day of celebration." `Umar said, "I know very well when and where it was revealed, and where Allah's Messenger (ﷺ) was when it was revealed. (It was revealed on) the day of `Arafat (Hajj Day), and by Allah, I was at `Arafat" Sufyan, a sub-narrator said: I am in doubt whether the Verse:-- "This day I have perfected your religion for you." was revealed on a Friday or not.
Sahih al-Bukhari 4606