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Recognised as Decade

1640s

  • 1640-1649
  • 3,653 days
  • 3 leap years
  • 17th century

The 1640s was the decade from 1 January 1640 to 31 December 1649, 3,653 days in total. It contained 3 leap years (1640, 1644, 1648). Counted strictly from year 1 the decade would run 1641 to 1650; this page uses the common reading.

Span of the decade

First day1 January 1640
Last day31 December 1649
Opened on aSunday
Closed on aFriday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century17th century

The years of the 1640s

1640Leap year, 366 days
1641Common year, 365 days
1642Common year, 365 days
1643Common year, 365 days
1644Leap year, 366 days
1645Common year, 365 days
1646Common year, 365 days
1647Common year, 365 days
1648Leap year, 366 days
1649Common year, 365 days

Leap years

Leap years1640, 1644, 1648
How many3a decade spanning a skipped century leap year has fewer
Common years7

Unix time

Start of the decade-10,413,792,000seconds since 1 January 1970
End of the decade-10,098,172,801the last second of 31 December

Where a decade starts

This page uses1640 to 1649the common reading, grouping years by their shared first three digits
The strict ordinal decade1641 to 1650counting in tens from year 1, the 165th decade runs 1641 to 1650
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 “1640s” by Nerdulator’s date engine. Nothing here was retrieved from a database of answers or written by a model.