Well, the Hijri date 29 Dhul Hijjah 1404 corresponds to the Gregorian date Monday, 24 September 1984. This date lies in the twelfth month of the Hijri year 1404 AH, which is Dhu Al-Hijjah of 1404 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1404/12/29 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.
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The following is the conversion of the Gregorian date 24 September 1984 to its equivalent Arabic date.
The following is the conversion of the Arabic date 29 Dhul Hijjah 1404 AH to its equivalent Gregorian date.
قَالُوا۟ لَبِثْنَا يَوْمًا أَوْ بَعْضَ يَوْمٍۢ فَسْـَٔلِ ٱلْعَآدِّينَ
They will say: We tarried by a day or part of a day. Ask of those who keep count!
Surah Al-Muminoon(23:113)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
"Verily! As for those whom the angels take (in death) while they are wronging themselves (as they stayed among the disbelievers even though emigration was obligatory for them), they (angels) say (to them): In what (condition) were you?..."(V.4:97)
Narrated Muhammad bin `Abdur-Rahman Abu Al-Aswad:
The people of Medina were forced to prepare an army (to fight against the people of Sham during the caliphate of `Abdullah bin Az-Zubair at Mecca), and I was enlisted in it; Then I met `Ikrima, the freed slave of Ibn `Abbas, and informed him (about it), and he forbade me strongly to do so (i.e. to enlist in that army), and then said, "Ibn `Abbas informed me that some Muslim people were with the pagans, increasing the number of the pagans against Allah's Messenger (ﷺ). An arrow used to be shot which would hit one of them (the Muslims in the company of the pagans) and kill him, or he would be struck and killed (with a sword)." Then Allah revealed:-- "Verily! as for those whom the angels take (in death) while they are wronging themselves (by staying among the disbelievers)" (4.97) Abu AlAswad also narrated it.
Sahih al-Bukhari 4596