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Recognised as Decade

1820s

  • 1820-1829
  • 3,653 days
  • 3 leap years
  • 19th century

The 1820s was the decade from 1 January 1820 to 31 December 1829, 3,653 days in total. It contained 3 leap years (1820, 1824, 1828). Counted strictly from year 1 the decade would run 1821 to 1830; this page uses the common reading.

Span of the decade

First day1 January 1820
Last day31 December 1829
Opened on aSaturday
Closed on aThursday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century19th century

The years of the 1820s

1820Leap year, 366 days
1821Common year, 365 days
1822Common year, 365 days
1823Common year, 365 days
1824Leap year, 366 days
1825Common year, 365 days
1826Common year, 365 days
1827Common year, 365 days
1828Leap year, 366 days
1829Common year, 365 days

Leap years

Leap years1820, 1824, 1828
How many3a decade spanning a skipped century leap year has fewer
Common years7

Unix time

Start of the decade-4,733,596,800seconds since 1 January 1970
End of the decade-4,417,977,601the last second of 31 December

Where a decade starts

This page uses1820 to 1829the common reading, grouping years by their shared first three digits
The strict ordinal decade1821 to 1830counting in tens from year 1, the 183rd decade runs 1821 to 1830
Which is correctBoth, for different questionsthe first is a naming convention, the second follows from counting; neither is derived from the other

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Every value on this page was computed from “1820s” by Nerdulator’s date engine. Nothing here was retrieved from a database of answers or written by a model.