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  1. en.wikipedia.org › wiki › Anno_DominiAnno Domini - Wikipedia

    The terms anno Domini (AD) and before Christ (BC) are used when designating years in the Julian and Gregorian calendars.

  2. 2021 was a common year starting on Friday of the Gregorian calendar, the 2021st year of the Common Era (CE) and Anno Domini (AD) designations, the 21st year of the 3rd millennium, the 21st year of the 21st century, and the 2nd year of the 2020s decade.

  3. en.wikipedia.org › wiki › AD_21AD 21 - Wikipedia

    AD 21 was a common year starting on Wednesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Tiberius and Drusus (or, less frequently, year 774 Ab urbe condita).

  4. www.wikiwand.com › en › 20212021 - Wikiwand

    2021 (MMXXI) was a common year starting on Friday of the Gregorian calendar, the 2021st year of the Common Era (CE) and Anno Domini (AD) designations, the 21st year of the 3rd millennium and the 21st century, and the 2nd year of the 2020s decade.