Well, the Hijri date 20 Rajab 1421 corresponds to the Gregorian date Tuesday, 17 October 2000. This date lies in the seventh month of the Hijri year 1421 AH, which is Rajab of 1421 AH. Both this Hijri and Gregorian date occur on the single day that is Tuesday without any doubt. The Arabic date 1421/07/20 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 17 October 2000 to its equivalent Arabic date.
The following is the conversion of the Arabic date 20 Rajab 1421 AH to its equivalent Gregorian date.
وَإِذَا ٱلْجِبَالُ نُسِفَتْ
And when the mountains are blown away,
Surah Al-Mursalaat(77:10)
Sahih al-Bukhari
Companions of the Prophet
Chapter: The merits of 'Ali bin Abi Talib رضي الله عنه
Narrated Ubaida:
Ali said (to the people of 'Iraq), "Judge as you used to judge, for I hate differences (and I do my best ) till the people unite as one group, or I die as my companions have died."
Sahih al-Bukhari 3707