Well, the Hijri date 12 Shawwal 1421 corresponds to the Gregorian date Sunday, 7 January 2001. This date lies in the tenth month of the Hijri year 1421 AH, which is Shawwal of 1421 AH. Both this Hijri and Gregorian date occur on the single day that is Sunday without any doubt. The Arabic date 1421/10/12 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 January 2001 to its equivalent Arabic date.
The following is the conversion of the Arabic date 12 Shawwal 1421 AH to its equivalent Gregorian date.
فَأَمَّا عَادٌۭ فَٱسْتَكْبَرُوا۟ فِى ٱلْأَرْضِ بِغَيْرِ ٱلْحَقِّ وَقَالُوا۟ مَنْ أَشَدُّ مِنَّا قُوَّةً ۖ أَوَلَمْ يَرَوْا۟ أَنَّ ٱللَّهَ ٱلَّذِى خَلَقَهُمْ هُوَ أَشَدُّ مِنْهُمْ قُوَّةًۭ ۖ وَكَانُوا۟ بِـَٔايَٰتِنَا يَجْحَدُونَ
As for A'ad, they were arrogant in the land without right, and they said: Who is mightier than us in power? Could they not see that Allah Who created them, He was mightier than them in power? And they denied Our revelations.
Surah Fussilat(41:15)