21st century

The 21st century was, as Jack Harkness cryptically said, "the time when everything changes." (TW: Everything Changes)

This century, generally defined in Earth's calendar as covering the years 2000 to 2099, was a period of great technological advancement, but also great political, economic, and ecological turmoil. The T-Mat and the Gravitron were developed in the middle part of this century, with the first excursions outside the Solar System occurring towards the century's end. The Thousand Day War between Earth and Mars was fought during this century (NA: Transit).

Decades

• 2000s

• 2010s

• 2020s

• 2030s

• 2040s

• 2050s

• 2060s

• 2070s

• 2080s

• 2090s

20th century	Timeline	22nd century