2100–2109

Millennium:	3rd millennium
Centuries:	21st century - 22nd century - 23rd century
Decades:	2070s 2080s 2090s - 2100s - 2110s 2120s 2130s
Years:	2100 2101 2102 2103 2104 2105 2106 2107 2108 2109

[edit] Events

On March 14 (which will be February 29 in the Julian calendar), the difference between the Julian calendar and the Gregorian calendar reaches 14 days. Since 14 is divisible by 7, this will be the first time in history since its inception that the Gregorian calendar has the same day of the week for each day of the year as the Julian calendar. This will last until February 28, 2200 of the Gregorian Calendar.
By 2100, 12% (about 1250) of the bird species existing at the beginning of the 21st century are expected to be extinct or threatened with extinction.^[1]
Polaris appears furthest North. Polaris' maximum apparent declination (taking account of nutation and aberration) will be 0.4526° from the celestial north pole, on 24 March 2100^[2].
A time capsule in Sneem, Ireland will be opened.
A time capsule in Bangor, Northern Ireland will be opened.
A time capsule in Kelowna, British Columbia will be opened.
December 31 will be the last day of the 21st Century/the current century.

"Revolt in 2100", Robert_A._Heinlein's science fiction book about rebellion against an American theocracy.
The stage "Starbase: Where No Turtle Has Gone Before" in the 1992 video game Teenage Mutant Ninja Turtles: Turtles in Time is set in the year A.D. 2100.
In the computer game Sid Meier's Alpha Centauri The United Nations Starship Unity's colony pods holding the seven factions of the game make Planetfall on Chiron, in the Alpha Centauri system.
In the console game Sid Meier's Civilization Revolution The world ends.
January 1, 2100 is the starting date for the roleplaying game Transhuman Space.
July 4, 2100 is the starting date for the real-time strategy PlayStation and computer game Warzone 2100.
The Sci-fi Anime series Kurau Phantom Memory begins in this year.
Much of the novel Shattered Time takes place starting with the characters reemerging in time on the date of December 23, 2100.

"War was beginning" according to the 1989 Japanese arcade game Zero Wing. This game was popularized by the phrase "All your base are belong to us".

In the Star Trek series, Mars is colonized in this year.
In the Mass Effect universe, the first permanent settlement on Mars, named Lowell City, is founded by the European Space Agency this year.

The sixth season of the Teenage Mutant Ninja Turtles 2003 TV series, known as Teenage Mutant Ninja Turtles: Fast Forward, takes place in 2105.
In the series Time Warp Trio, 2105 is when the girls (Jodie, Freddi, and Samantha) live.
In the Animatrix, 2105 is when Operation Dark Storm is supposed to be initiated.
In the Pixar film WALL-E, the Axiom spaceship which carries several hundred humans leaves Earth.

^ Pimm, Stuart; et al. (2006). "Human impacts on the rates of recent, present, and future bird extinctions". PNAS 103 (29): 10941–10946. doi:10.1073/pnas.0604181103.
^ Jean Meeus, Mathematical Astronomy Morsels Ch.50 ; Willmann-Bell 1997.