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Centuries: 1st century BH1st century2nd century
Years: 18 19 202122 23 24

Year 21 AH[1] started on Monday, December 10, 641 CE, and ended on Friday, November 29, 642 CE[2].

Notes

  1. Latin: Anno Hegirae, "in the year of the Hijra (Lunar Hijri calendar)
  2. WikiShia:Manual of Style/Dates