Well, the Hijri date 11 Ramadan 1421 corresponds to the Gregorian date Thursday, 7 December 2000. This date lies in the ninth month of the Hijri year 1421 AH, which is Ramadan of 1421 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1421/09/11 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 7 December 2000 to its equivalent Arabic date.
The following is the conversion of the Arabic date 11 Ramadan 1421 AH to its equivalent Gregorian date.
فَإِن زَلَلْتُم مِّنۢ بَعْدِ مَا جَآءَتْكُمُ ٱلْبَيِّنَٰتُ فَٱعْلَمُوٓا۟ أَنَّ ٱللَّهَ عَزِيزٌ حَكِيمٌ
And if ye slide back after the clear proofs have come unto you, then know that Allah is Mighty, Wise.
Surah Al-Baqara(2:209)
Sahih al-Bukhari
Afflictions and the End of the World
Chapter: The coming of the Fire
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "Soon the river "Euphrates" will disclose the treasure (the mountain) of gold, so whoever will be present at that time should not take anything of it." Al-A'raj narrated from Abii Huraira that the Prophet (ﷺ) said the same but he said, "It (Euphrates) will uncover a mountain of gold (under it).
Sahih al-Bukhari 7119