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Recognised as Decade

1620s

  • 1620-1629
  • 3,653 days
  • 3 leap years
  • 17th century

The 1620s was the decade from 1 January 1620 to 31 December 1629, 3,653 days in total. It contained 3 leap years (1620, 1624, 1628). Counted strictly from year 1 the decade would run 1621 to 1630; this page uses the common reading.

Span of the decade

First day1 January 1620
Last day31 December 1629
Opened on aWednesday
Closed on aMonday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century17th century

The years of the 1620s

1620Leap year, 366 days
1621Common year, 365 days
1622Common year, 365 days
1623Common year, 365 days
1624Leap year, 366 days
1625Common year, 365 days
1626Common year, 365 days
1627Common year, 365 days
1628Leap year, 366 days
1629Common year, 365 days

Leap years

Leap years1620, 1624, 1628
How many3a decade spanning a skipped century leap year has fewer
Common years7

Unix time

Start of the decade-11,044,944,000seconds since 1 January 1970
End of the decade-10,729,324,801the last second of 31 December

Where a decade starts

This page uses1620 to 1629the common reading, grouping years by their shared first three digits
The strict ordinal decade1621 to 1630counting in tens from year 1, the 163rd decade runs 1621 to 1630
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 “1620s” by Nerdulator’s date engine. Nothing here was retrieved from a database of answers or written by a model.