Well, the Hijri date 8 Rabi Al Thani 1421 corresponds to the Gregorian date Monday, 10 July 2000. This date lies in the fourth month of the Hijri year 1421 AH, which is Rabi Al-Thani of 1421 AH. Both this Hijri and Gregorian date occur on the single day that is Monday without any doubt. The Arabic date 1421/04/08 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 July 2000 to its equivalent Arabic date.
The following is the conversion of the Arabic date 8 Rabi Al Thani 1421 AH to its equivalent Gregorian date.
أَفَمَن يَتَّقِى بِوَجْهِهِۦ سُوٓءَ ٱلْعَذَابِ يَوْمَ ٱلْقِيَٰمَةِ ۚ وَقِيلَ لِلظَّٰلِمِينَ ذُوقُوا۟ مَا كُنتُمْ تَكْسِبُونَ
Is he then, who will strike his face against the awful doom upon the Day of Resurrection (as he who doeth right)? And it will be said unto the wrong-doers: Taste what ye used to earn.
Surah Az-Zumar(39:24)
Sahih al-Bukhari
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Allah's Statement: "Verily, We have sent revelation to you, (O Muhammad ﷺ ) ... (till) ... as We sent revelation to Nuh (Noah) and Yunus (Jonah), Hãrün (Aaron) and Sulaimãn (Solomon)..." (V.4:163)
Narrated Abu Huraira:
The Prophet (ﷺ) said, "Whoever says that I am better than Jonah bin Matta, is a liar."
Sahih al-Bukhari 4604