Well, the Hijri date 27 Shaban 1421 corresponds to the Gregorian date Thursday, 23 November 2000. This date lies in the eighth month of the Hijri year 1421 AH, which is Shaban of 1421 AH. Both this Hijri and Gregorian date occur on the single day that is Thursday without any doubt. The Arabic date 1421/08/27 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 23 November 2000 to its equivalent Arabic date.
The following is the conversion of the Arabic date 27 Shaban 1421 AH to its equivalent Gregorian date.
فَٱصْفَحْ عَنْهُمْ وَقُلْ سَلَٰمٌۭ ۚ فَسَوْفَ يَعْلَمُونَ
Then bear with them (O Muhammad) and say: Peace. But they will come to know.
Surah Az-Zukhruf(43:89)