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(2nd millennium – 3rd millennium – 4th millennium – other millennia)
The third millennium is a period of time which began on January 1, 2001 and will end on December 31, 3000.
However, the majority celebrations for the start of the third millennium occurred at midnight on December 31 1999 / January 1 2000. The first decade of the new millennium (see below) contains the year 2000.
Centuries and Decades
| 21st century | 2000s | 2010s | 2020s | 2030s | 2040s | 2050s | 2060s | 2070s | 2080s | 2090s |
| 22nd century | 2100s | 2110s | 2120s | 2130s | 2140s | 2150s | 2160s | 2170s | 2180s | 2190s |
| 23rd century | 2200s | 2210s | 2220s | 2230s | 2240s | 2250s | 2260s | 2270s | 2280s | 2290s |
| 24th century | 2300s | 2310s | 2320s | 2330s | 2340s | 2350s | 2360s | 2370s | 2380s |
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