Well, the Hijri date 4 Rabi Al Awwal 1421 corresponds to the Gregorian date Tuesday, 6 June 2000. This date lies in the third month of the Hijri year 1421 AH, which is Rabi Al-Awwal of 1421 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1421/03/04 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 6 June 2000 to its equivalent Arabic date.
The following is the conversion of the Arabic date 4 Rabi Al Awwal 1421 AH to its equivalent Gregorian date.
إِنَّهُۥ مِنْ عِبَادِنَا ٱلْمُؤْمِنِينَ
Lo! he is one of Our believing slaves.
Surah As-Saaffaat(37:81)
Sahih al-Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Chapter: What is allowed as regards the interpretation of the Taurat and other Holy Books
And Ibn 'Abbas narrated:
Abu Sufyan bin Harb told me that Heraclius called for his translator and then asked for the letter of the Prophet (ﷺ), and the former read it (thus): "In the Name of Allah, the Most Gracious, the Merciful. (This letter is) from Muhammad bin 'Abdullah, to Heraclius. "...O people of the Scripture (Jews and Christians): Come to a word that is just between us and you that we worship none but Allah..." (V.3:64)
Sahih al-Bukhari 7541