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Recognised as Decade

1200s

  • 1200-1209
  • 3,653 days
  • 3 leap years
  • 12th century

The 1200s was the decade from 1 January 1200 to 31 December 1209, 3,653 days in total. It contained 3 leap years (1200, 1204, 1208). Counted strictly from year 1 the decade would run 1201 to 1210; this page uses the common reading.

Span of the decade

First day1 January 1200
Last day31 December 1209
Opened on aSaturday
Closed on aThursday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century12th century

The years of the 1200s

1200Leap year, 366 days
1201Common year, 365 days
1202Common year, 365 days
1203Common year, 365 days
1204Leap year, 366 days
1205Common year, 365 days
1206Common year, 365 days
1207Common year, 365 days
1208Leap year, 366 days
1209Common year, 365 days

Leap years

Leap years1200, 1204, 1208
How many3a decade spanning a skipped century leap year has fewer
Common years7

Unix time

Start of the decade-24,298,876,800seconds since 1 January 1970
End of the decade-23,983,257,601the last second of 31 December

Where a decade starts

This page uses1200 to 1209the common reading, grouping years by their shared first three digits
The strict ordinal decade1201 to 1210counting in tens from year 1, the 121st decade runs 1201 to 1210
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 “1200s” by Nerdulator’s date engine. Nothing here was retrieved from a database of answers or written by a model.