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Recognised as Decade

1840s

  • 1840-1849
  • 3,653 days
  • 3 leap years
  • 19th century

The 1840s was the decade from 1 January 1840 to 31 December 1849, 3,653 days in total. It contained 3 leap years (1840, 1844, 1848). Counted strictly from year 1 the decade would run 1841 to 1850; this page uses the common reading.

Span of the decade

First day1 January 1840
Last day31 December 1849
Opened on aWednesday
Closed on aMonday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century19th century

The years of the 1840s

1840Leap year, 366 days
1841Common year, 365 days
1842Common year, 365 days
1843Common year, 365 days
1844Leap year, 366 days
1845Common year, 365 days
1846Common year, 365 days
1847Common year, 365 days
1848Leap year, 366 days
1849Common year, 365 days

Leap years

Leap years1840, 1844, 1848
How many3a decade spanning a skipped century leap year has fewer
Common years7

Unix time

Start of the decade-4,102,444,800seconds since 1 January 1970
End of the decade-3,786,825,601the last second of 31 December

Where a decade starts

This page uses1840 to 1849the common reading, grouping years by their shared first three digits
The strict ordinal decade1841 to 1850counting in tens from year 1, the 185th decade runs 1841 to 1850
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 “1840s” by Nerdulator’s date engine. Nothing here was retrieved from a database of answers or written by a model.