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Decade

1660s

  • 1660-1669
  • 3,653 days
  • 3 leap years
  • 17th century

The 1660s was the decade from 1 January 1660 to 31 December 1669, 3,653 days in total. It contained 3 leap years (1660, 1664, 1668). Counted strictly from year 1 the decade would run 1661 to 1670; this page uses the common reading.

Span of the decade

First day1 January 1660
Last day31 December 1669
Opened on aThursday
Closed on aTuesday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century17th century

The years of the 1660s

1660Leap year, 366 days
1661Common year, 365 days
1662Common year, 365 days
1663Common year, 365 days
1664Leap year, 366 days
1665Common year, 365 days
1666Common year, 365 days
1667Common year, 365 days
1668Leap year, 366 days
1669Common year, 365 days

Leap years

Leap years1660, 1664, 1668
How many3a decade spanning a skipped century leap year has fewer
Common years7

Unix time

Start of the decade-9,782,640,000seconds since 1 January 1970
End of the decade-9,467,020,801the last second of 31 December

Where a decade starts

This page uses1660 to 1669the common reading, grouping years by their shared first three digits
The strict ordinal decade1661 to 1670counting in tens from year 1, the 167th decade runs 1661 to 1670
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 “1660s” by Nerdulator’s date engine. Nothing here was retrieved from a database of answers or written by a model.