Decade
2040s
- 2040-2049
- 3,653 days
- 3 leap years
- 21st century
The 2040s will be the decade from 1 January 2040 to 31 December 2049, 3,653 days in total. It contains 3 leap years (2040, 2044, 2048). Counted strictly from year 1 the decade would run 2041 to 2050; this page uses the common reading.
Span of the decade
First day1 January 2040
Last day31 December 2049
Opened on aSunday
Closed on aFriday
Days in the decade3,653
Weeks in the decade521 and 6 days
Century21st century
The years of the 2040s
Leap years
Leap years2040, 2044, 2048
How many3a decade spanning a skipped century leap year has fewer
Common years7
Unix time
Start of the decade2,208,988,800seconds since 1 January 1970
End of the decade2,524,607,999the last second of 31 December
Where a decade starts
This page uses2040 to 2049the common reading, grouping years by their shared first three digits
The strict ordinal decade2041 to 2050counting in tens from year 1, the 205th decade runs 2041 to 2050
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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