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Recognised as Decade

1140s

  • 1140-1149
  • 3,653 days
  • 3 leap years
  • 12th century

The 1140s was the decade from 1 January 1140 to 31 December 1149, 3,653 days in total. It contained 3 leap years (1140, 1144, 1148). Counted strictly from year 1 the decade would run 1141 to 1150; this page uses the common reading.

Span of the decade

First day1 January 1140
Last day31 December 1149
Opened on aMonday
Closed on aSaturday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century12th century

The years of the 1140s

1140Leap year, 366 days
1141Common year, 365 days
1142Common year, 365 days
1143Common year, 365 days
1144Leap year, 366 days
1145Common year, 365 days
1146Common year, 365 days
1147Common year, 365 days
1148Leap year, 366 days
1149Common year, 365 days

Leap years

Leap years1140, 1144, 1148
How many3a decade spanning a skipped century leap year has fewer
Common years7

Unix time

Start of the decade-26,192,332,800seconds since 1 January 1970
End of the decade-25,876,713,601the last second of 31 December

Where a decade starts

This page uses1140 to 1149the common reading, grouping years by their shared first three digits
The strict ordinal decade1141 to 1150counting in tens from year 1, the 115th decade runs 1141 to 1150
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 “1140s” by Nerdulator’s date engine. Nothing here was retrieved from a database of answers or written by a model.