Well, the Hijri date 21 Shaban 1404 corresponds to the Gregorian date Tuesday, 22 May 1984. This date lies in the eighth month of the Hijri year 1404 AH, which is Shaban of 1404 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1404/08/21 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 22 May 1984 to its equivalent Arabic date.
The following is the conversion of the Arabic date 21 Shaban 1404 AH to its equivalent Gregorian date.
فَتَلَقَّىٰٓ ءَادَمُ مِن رَّبِّهِۦ كَلِمَٰتٍۢ فَتَابَ عَلَيْهِ ۚ إِنَّهُۥ هُوَ ٱلتَّوَّابُ ٱلرَّحِيمُ
Then Adam received from his Lord words (of revelation), and He relented toward him. Lo! He is the relenting, the Merciful.
Surah Al-Baqara(2:37)
Sahih al-Bukhari
Prophets
Chapter: The Statement of Allah Taa'la: "O people of the Scriptures! Do not exceed the limits in your religion..."
Narrated 'Ubada:
The Prophet (ﷺ) said, "If anyone testifies that None has the right to be worshipped but Allah Alone Who has no partners, and that Muhammad is His Slave and His Apostle, and that Jesus is Allah's Slave and His Apostle and His Word which He bestowed on Mary and a Spirit created by Him, and that Paradise is true, and Hell is true, Allah will admit him into Paradise with the deeds which he had done even if those deeds were few." (Junada, the sub-narrator said, " 'Ubada added, 'Such a person can enter Paradise through any of its eight gates he likes.")
Sahih al-Bukhari 3435