There are no recorded events this year. See an overview of when world history happened.
The year 2021 BC was a common year starting on a Friday, just like 2118 BC, 2107 BC, 2096 BC, 2090 BC, 2079 BC, 2068 BC, 2062 BC, 2051 BC, 2040 BC, 2034 BC in the century before it and 2012 BC, 2006 BC, 1995 BC, 1984 BC, 1978 BC, 1967 BC, 1956 BC, 1950 BC, 1939 BC, 1928 BC in the next.
The coloured days highlight
births
,
deaths
,
political
,
scientific
,
artistic
and
other
historical milestones, and recurring events such as anniversaries and
holidays
.
The new
,
waxing
,
full
and
waning
icons indicate the phases of the moon and appear only for dates in the Gregorian calendar, i.e. after 14 October 1582. The Chinese calendar is available only from 1645 to 2644, the first millenium since the last reform. The coloured columns mark the Sundays, the last day of the week per standard ISO-8601.
The normal calendar page for the current /year?2013 contains an introduction to the intriguing history of the year as we know it. The Calendar Converter has more detail. The so called Perpetual Calendar uses a trick from before the age of computers to find the weekday for any Gregorian date. Also see an overview of all historical events in the last six thousand years.