|This article or subsection has an associated category.||2040|
|years:|| 2037 2038 2039 2040 2041 2042 2043
(stardates from 2040.0)
|decades:||2010s 2020s 2030s 2040s 2050s 2060s 2070s|
|centuries:||20th century - 21st century - 22nd century|
2040 was, on Earth's calendar, the 41st year of the 21st century, and the first year of the 2040s decade. Although this was a time period before Human formulation of stardates, this era begins with stardate 2040.0.