Timeline of Star Trek

This article discusses the fictional timeline of the Star Trek franchise. The franchise is primarily set in the future, ranging from the mid-22nd century (Star Trek: Enterprise) to the early 25th century (Star Trek: Picard), with the third season of Star Trek: Discovery jumping forward to the 32nd century; this is also the setting of Star Trek: Starfleet Academy. The franchise has also outlined a fictional future history of Earth prior to this, and, primarily through time travel plots, explored both past and further-future settings.

The chronology is complicated by the presence of divergent timelines within the franchise's narrative, as well as internal contradictions and retcons. The original series generally avoided assigning real-world dates to its futuristic setting, instead using the stardate system. Series from Star Trek: The Next Generation onwards defined their temporal settings in conventional form.

Series, books, and film settings

This table shows each TV series and movie, its year of release or broadcast, the year it was set in according to the prevailing Okuda chronology (see below), and the stardate range for that year. The designation Enterprise-based series are the series that featured the various incarnations of the starship USS Enterprise. In universe timeline chronological order Star Trek: Enterprise (ENT), Star Trek: The Original Series (TOS), Star Trek: The Animated Series (TAS), Star Trek: The Next Generation (TNG), and all 13 of the Star Trek feature films, including the three newest J. J. Abrams "reboot" films, or "Kelvin Timeline" based on the original series.

{| class="wikitable"

!Year

!Stardates

!Enterprise, Strange New Worlds, The Original Series, The Next Generation, Picard, original timeline films, major events

! Animated series

! Novels and comics

!Deep Space Nine

!Voyager

!Discovery

!Starfleet Academy

!Reboot films (Kelvin timeline)

!Video games

|Before the birth of the Universe

|"Death Wish" (1996)

|3.5 billion years ago

|The Next Generation "All Good Things..." (1994) [primordial Earth]

|~2840 BC

|Star Trek "All Our Yesterdays" (1969) [primary plotline]

|Late-12th-century AD

|The Next Generation "Qpid" (1991) [primary plotline]

|1893 AD

|The Next Generation "Time's Arrow" (1992) [primary plotline]

|1930

|Star Trek "The City on the Edge of Forever" (1967) [primary plotline]

|1944

|Enterprise "Storm Front" (2004) [primary plotline]

|1947

|"Little Green Men" (1995) [primary plotline]

|1957

|Enterprise "Carbon Creek" (2002) [primary plotline]

|1968

|Star Trek "Assignment: Earth" (1968) [primary plotline]

|1969

|Star Trek "Tomorrow Is Yesterday" (1967) [primary plotline]

|1986

|The Voyage Home (1986) [primary plotline]

|1992–1996

|Eugenics Wars (2001–2002)

|Khan [secondary plotline]

|"Future's End" (1996) [primary plotline]

|2000

|"11:59" (1999) [primary plotline]

|2004

|Enterprise "Carpenter Street" (2003) [primary plotline]

|2022

|Strange New Worlds "Tomorrow and Tomorrow and Tomorrow" (2023) [primary plotline]

|2024

| Picard season 2 (2022) [past timeline]

|"Past Tense" (1995) [primary plotline]

|2032

|"One Small Step" (1999) [primary plotline]

|2037

|Enterprise "E²" (2004) [flashback]

|2026–2053

|World War III

|2054–2079

|Post-atomic horror

|2063

|First Contact (1996) [primary plotline] and Enterprise "In a Mirror, Darkly" (2005) [Prologue - Origins of the Mirror Universe]

|2137

|Enterprise "The Forge" (2004) [Prologue]

|2143

|Enterprise "Cold Station 12" (2004) [Flashback]

|2151–2152

|Enterprise season 1 (2001–2002)

|2152–2153

|Enterprise season 2 (2002–2003)

|2153–2154

|Enterprise season 3 (2003–2004)

|2154–2155

|Enterprise season 4 (2004–2005)

|2156–2160

|Earth–Romulan War

|2161

|Enterprise "These Are the Voyages..." (2005) holodeck simulation of the events Founding of the United Federation of Planets

|2164

|2164 (Reboot Stardate)

|USS Franklin goes missing: Star Trek Beyond (2016)

|2165

|Enterprise "Twilight" (2003) [Primary plotline/alternate future]

|2233

|2233 (Reboot Stardate)

|Star Trek (2009) [prologue]

|2238

|Discovery "The Sound of Thunder" (2019) [Flashback]

|2233–2258

|2233–2258 (Reboot Stardates)

|Nero comics

|2245–2250

|The Constitution-class USS Enterprise (NCC-1701) is launched under the command of Captain Robert April and begins its first 5-year mission.

|2254

|Star Trek "The Cage" (1964)

|2256–2257

|1207

| Klingon-Federation War

|Discovery season 1 (2017–2018)

|2258–2259

|2258–2259 (Reboot Stardate)

|Discovery season 2 (2018–2019)

|Star Trek (2009)

|2259

|2259 (Reboot Stardate)

|Star Trek: Strange New Worlds season 1 (2022) and season 2 (2023)

|Khan [primary plotline]

|2259–2260

|2259–2260 (Reboot Stardate)

|Star Trek Into Darkness (2013)

|2261

|Star Trek: Strange New Worlds season 3 (2025)

|2263

|2263 (Reboot Stardate)

|Star Trek Beyond (2016)

|2265

|1000–1499

|Star Trek "Where No Man Has Gone Before" (1965)

|2266

|Strange New Worlds "A Quality of Mercy" (2022) [Alternate Future of the Balance of Terror]

|2266–2267

|1500–3299

|Star Trek season 1 (1966–1967)

|2267–2268

|3300–4799

|Star Trek season 2 (1967–1968)

|"Trials and Tribble-ations" (1996) [primary plotline taking place within "The Trouble with Tribbles"]

|2268–2269

|4800–5999

|Star Trek season 3 (1968–1969)

|2269–2270

|5221–5683

|The Animated Series season 1 (1973–1974)

|Killing Time

|2270

|6000–6146

|The Animated Series season 2 (1974)

|2273

|7410–7599

|The Motion Picture (1979)

|2275

|Spock's World

|2278

|7818

|USS Bozeman launched: "Cause and Effect" (1992)

|2285

|8100–8299

|The Wrath of Khan (1982) The Search for Spock (1984)

|2286

|8300–8399

|The Voyage Home (1986)

|2287

|8400–8499

|The Final Frontier (1989)

|2293

|9500–9999

|The Undiscovered Country (1991) Generations (1994) [prologue]

|"Flashback" (1996) [flashback taking place within The Undiscovered Country]

|2298–2364

|The Lost Era novels

|2324

|1292.4

|Star Trek: Section 31 (2025)

|2333–2355

|10000–32999

|Stargazer novels

|2354–2381

|31000–58999

|New Frontier novels

|2364

|41000–41999

|The Next Generation season 1 (1987–1988) The Next Generation "All Good Things..." (1994) [past timeline]

|2365

|42000–42999

|The Next Generation season 2 (1988–1989)

|2366

|43000–43999

|The Next Generation season 3 (1989–1990)

|2367

|44000–44999

|The Next Generation season 4 (1990–1991)

|"Emissary" (1993) [flashback to the Battle of Wolf 359]

|2368

|45000–45999

|The Next Generation season 5 (1991–1992)

|2369

|46000–46999

|The Next Generation season 6 (1992–1993)

|Deep Space Nine season 1 (1993)

|2370

|47000–47999

|The Next Generation season 7 (1993–1994) Enterprise "These Are the Voyages..." (2005) [main timeline]

|Q-Squared

|Deep Space Nine season 2 (1993–1994)

|2371

|48000–48999

|Generations (1994)

|Deep Space Nine season 3 (1994–1995)

|Voyager season 1 (1995)

|2372

|49000–49999

|Deep Space Nine season 4 (1995–1996)

|Voyager season 2 (1995–1996)

|2373

|50000–50999

|First Contact (1996)

Dominion War

|Deep Space Nine season 5 (1996–1997)

|Voyager season 3 (1996–1997)

|2374

|51000–51999

|Dominion War

|Deep Space Nine season 6 (1997–1998)

|Voyager season 4 (1997–1998)

|2375

|52000–52999

|Dominion War

Insurrection (1998)

|Deep Space Nine season 7 (1998–1999)

|Voyager season 5 (1998–1999)

|2376

|53000–53999

|A Stitch in Time

|Voyager season 6 (1999–2000)

|2377–2378

|54000–55599

|Voyager season 7 (2000–2001)

|2378–2379

|55600–56399

|A Time to... novels

|2379

|56400–56899

|Nemesis (2002)

|2380

|57000–57999

| Lower Decks season 1 (2020)

|2381

|58000–58999

| Lower Decks season 2 (2021), season 3 (2022), and season 4 (2023)

|2379–2386

|56900–63999

|Utopia Planitia Shipyards, Picard season 1 (2020)

|Titan novels

|2383

| Prodigy season 1 (2021)

|2385

|Utopia Planitia Shipyards Destruction, Picard Season 1, Episode 2 (2020)

|2387

|64000–64999

|Star Trek (2009) [flashback]

|Countdown

|2390

|"Timeless" (1998) [future timeline]

|2395

|72000–72999

|The Next Generation "All Good Things..." (1994) [future timeline]

|2399

|76000–76999

|Picard season 1 (2020)

|2401

|78183

|Picard season 2 (2022) [main timeline] and season 3 (2023)

|2404

|"Endgame" (2001) [future timeline]

|2409-2411

|Star Trek Online (2010)

|2450

|"The Visitor" (1995) [future timeline]

|2554

| Enterprise "Azati Prime" (2004) [Battle of Procyon 5]

|2875

|"Relativity" (1999) [future timeline]

|3052

|Enterprise "Shockwave" (2002) [future timeline]

|3069–3089

| The Burn, followed by the collapse of most of the United Federation of Planets

|3074

|"Living Witness" (1998)

|3180

|Starfleet Academy season 1 (2026) [Prologue]

|3186

|"The Red Angel" (2019)

|3188-89

|Discovery season 3 (2020)

|3190

|Discovery season 4 (2021–22)

|3191

|Discovery season 5 (2024)

|3195

|Starfleet Academy season 1 (2026)

|43rd century

|"Calypso" (Short Treks, 2018)

Timeline in order of series air dates

Chronology and events

This timeline is based on the Star Trek Chronology model described below, supplemented by data from the website startrek.com.

c. 6 billion years ago
The Guardian of Forever is formed.
c. 4 billion years ago
A humanoid civilization seeds the oceans of many planets with genetic material, which would lead to the development of humanoids on many planets.
c. 65 to 100 million years ago
The dinosaurs (the Voth civilization) from the episode "Distant Origin" are most likely descendants of Hadrosauridae who lived in the Cretaceous period of Earth's history.
c. 1 million years ago
Sargon's people explore the galaxy and colonize various planets, possibly including Vulcan.
c. 600,000 years ago
The Tkon Empire, an interstellar state consisting of dozens of star systems in the Alpha Quadrant, becomes extinct.
c. 200,000 years ago
The Iconian civilization is destroyed.
c. 8,000 BC
The Dominion may have been founded in the Gamma Quadrant by the shapeshifting race known as the Changelings around this time, possibly in a different form than is known in the modern timeline.
c. 2700 BC
A group of extraterrestrial beings land on Earth and are eventually known as the Greek gods, as established in the episode "Who Mourns for Adonais?".

1st millennium of the Common Era

c. 4th century AD
The Vulcan Time of Awakening. In the midst of horrific wars on Vulcan, the philosopher Surak leads his people, teaching them to embrace logic and suppress all emotion. Those who refuse to follow Surak leave the Vulcan system and eventually colonize Romulus. ("Awakening" (ENT), "Balance of Terror" (TOS))
The Dominion may have been founded in the Gamma Quadrant by the shapeshifting race known as the Changelings (Founders) around this time.
c. 9th century
Kahless the Unforgettable unites the Klingons by defeating the tyrant Molor in battle, and provides his people with teachings based on a philosophy of honor.

Pre-20th century

c. 1505
The Borg are known to exist in the Delta Quadrant, 900 years prior to Voyager landing on the planet as referenced by the Vaadwaur "Dragon's Teeth" (VOY).
c. 1570
The ancient Bajorans use solar sail ships to explore their star system, and one may have reached Cardassia.
18th century
The Suliban homeworld becomes uninhabitable ("Detained" (ENT)).
The Preservers transport various Native Americans to a faraway planet.
c. 1864
The Skagarans abduct humans for use as slaves in their colony world (as referred to in Enterprise Season 3: "North Star").
c. 1871
The Cardassian Union is established.
1888
August 31: Jack the Ripper's first victim is found murdered and mutilated in East London (as referred to in Star Trek: The Original Series Season 2: "Wolf in the Fold").
c. 1893
"Time's Arrow" (TNG).

20th century

1918
World War I ends with 15–22 million dead ("Bread and Circuses (TOS)").
1930
Social activist Edith Keeler dies in a traffic accident in New York. In an alternate timeline where she lives, she becomes the leader of a peace movement that indirectly leads to Nazi Germany winning World War II. ("The City on the Edge of Forever" (TOS)).
1937
Several hundred humans are secretly abducted by an alien race known as the Briori and brought to the Delta Quadrant. Eight are cryogenically frozen, including long-lost pilot Amelia Earhart ("The 37's" (VOY)).
1944 (alternate timeline)
In an alternate timeline caused by incursions from the Temporal Cold War of the 27th-31st centuries, Nazi Germany wins World War II with the help of an alien species called the Na'kuhl. The crew of the starship Enterprise (NX-01), arriving here from 2153, defeat the Na'kuhl, end the Temporal Cold War and return to their own time. ("Storm Front" (ENT))
1945
World War II ends with 70–85 million dead ("Bread and Circuses (TOS)").
The United Nations is established in San Francisco but its headquarters move to New York City.
1947
Three Ferengi (Quark, Rom, and Nog) crash land in the New Mexico desert, and are held by the U.S. government at a secret base for scientific study ("Little Green Men" (DS9)).
1957
A Vulcan scout ship visits Earth, according to a story told by T'Pol (presumably a true story as T'Pol examines a purse which was portrayed as used by her great-great-grandmother during the story; see episode entry) ("Carbon Creek" (ENT)).
1967
Captain Braxton's 29th century Federation timeship Aeon crashlands on Earth ("Future's End" (Voyager)).
1968
"Assignment: Earth" (TOS) past events.
1969
"Tomorrow Is Yesterday" (TOS) past events.
1986
Star Trek IV: The Voyage Home past events. Two humpback whales are brought forward in time to 2286 in order to repopulate their species after it became extinct.
1992
The Eugenics Wars (WWIII) begin. At the height of his influence, the genetically augmented tyrant Khan Noonien Singh is said to be the absolute ruler of more than one-quarter of Earth's population. (WWIII is retconned to be in the 2050s by TNGs Encounter at Farpoint and Star Trek First Contact and to being a conflict separate from the Eugenics Wars; SNWs "Strange New World" retcons it to taking place in the 21st century, prior to WWIII.)
1996
The Eugenics Wars end.
2000
The past events of "11:59" (VOY).

21st century

2002
The interstellar probe Nomad is launched.
2004
The past events of "Carpenter Street" (ENT).
2009
The first successful Earth-Saturn probe takes place.
2012
The world's first self-sustaining civic environment, Millennium Gate, which became the model for the first habitat on Mars, is completed in Portage Creek, Indiana ("11:59" (VOY)).
2018
Sleeper ships are made obsolete.
2022
The past events of "Tomorrow and Tomorrow and Tomorrow" (SNW).
2024
A united Ireland is achieved (TNG "The High Ground").
The past events of "Past Tense" (DS9), namely the "Bell Riots".
The past events of Star Trek: Picard Season 2.
2026
World War III begins on Earth. Colonel Phillip Green and a group of eco-terrorists commit genocide that claimed the lives of thirty-seven million people. (ENT "In A Mirror Darkly, Part Two") (In TOS, WWIII took place in the 1990s and is established as an alternate name for the Eugenics Wars
Zefram Cochrane is born.
2037
The spaceship Charybdis makes an attempt to leave the solar system.
2047
The Hermosa quake strikes the region of southern California surrounding Los Angeles. The land sinks under two hundred meters of water. In the ensuing centuries, the region recovers, having transformed into one of the world's largest coral reefs. These reefs become home to thousands of different marine species.
2053
World War III ends and Earth is left devastated, mostly because of nuclear warfare. Most of the major cities are left in ruins with few remaining governments and the death toll reaching 600 million. Scientific advancement continues, however. (In TOS, WWIII took place in the 1990s and is established as an alternate name for the Eugenics Wars
2067
The uncrewed interstellar warp probe Friendship 1 is launched.
2069
The colony ship SS Conestoga is launched. It would found the Terra Nova colony.
2079
Earth begins to recover from its nuclear war. The recovery is aided and partially organized by a newly established political entity called the European Hegemony.
2119
Zefram Cochrane, who now is residing on Alpha Centauri, sets off for parts unknown and disappears. Some had thought he was testing a new engine. After an exhaustive search, it is believed that Cochrane has died. He becomes one of the most famous missing people in history.
2129
Hoshi Sato is born.
2151
First contact between humans and Klingons. The NX-01 Enterprise, commanded by Captain Jonathan Archer, begins her exploratory mission. ("Broken Bow" (ENT))
2153
As a result of incursions from the Temporal Cold War of the 27th-31st centuries, a confederation of species called the Xindi test-fire a planet killer weapon against Earth, causing approximately 1 million casualties ("The Expanse" (ENT)). The NX-01 Enterprise defeats the Xindi but is thrown back in time to 1944. ("Zero Hour" (ENT))
2154
Captain Archer rediscovers Surak's lost writings, thwarting the Romulans' infiltration of Vulcan's government. ("Kir'Shara" (ENT))
The Klingon species becomes infected by a genetically engineered virus. The cure, using human antibodies, causes the Klingons to lose their cranial ridges and become slightly less aggressive. ("Divergence" (ENT))
2155
The USS Defiant, a Constitution-class vessel from the Prime Universe in 2268, travels back in time and also emerges in the Mirror Universe following its interaction with an anomaly. The abandoned Defiant is found by the Tholians. The Terran Empire learns of the ship's existence and subsequently captures it for their own use. ("In a Mirror, Darkly" (ENT))
2156–2160
The Earth–Romulan War is fought between United Earth and its allies, and the Romulan Star Empire. The war ends with the Battle of Cheron, a humiliating defeat to the Romulans, to such a degree that the Empire still considers the battle an embarrassment over 200 years later. The Romulan Neutral Zone is established.
2165
Sarek, Federation diplomat and father of Spock, is born on Vulcan.
2184
Jonathan Archer is elected as the first United Federation of Planets President.
2192
Jonathan Archer steps down as UFP President after eight years.
2195
Robert April is born.
2160s to 2196
The Daedalus-class starship is active.

23rd century

2222
Montgomery Scott is born in Scotland.
2226
Michael Burnham is born on Earth.
2227
Leonard McCoy is born in Georgia, North America on Earth.
2230
Spock, the son of Sarek and the human Amanda Grayson, is born on Vulcan.
2232
The events of Star Trek: Short Treks episode "The Girl Who Made the Stars" take place.
2233
James T. Kirk is born in Riverside, Iowa on Earth.
2233 (alternate timeline): Prologue scene of Star Trek.
Ambassador Spock and the Romulan mining ship Narada, commanded by Nero, emerge from a black hole created by Spock's detonation of red matter in 2387 and arrive in the past. Nero's arrival and subsequent attack on the USS Kelvin create the Kelvin Timeline.
James T. Kirk is born aboard a shuttlecraft from the USS Kelvin.
James T. Kirk's father, George Kirk, is killed.
2238
The events of Star Trek: Short Treks episode "The Brightest Star" take place.
2241 (alternate timeline)
Pavel Chekov born in Russia on Earth.
2245–2250
The USS Enterprise, a Constitution class vessel, is launched under the command of Robert April, on a five-year mission of exploration. In the alternate timeline created by Nero's attack on the USS Kelvin, Chekov is only eight years younger than James T. Kirk, implying a birthdate of 2241.
2250
After a refit, the USS Enterprise (NCC-1701) is launched on a second five-year mission. Command of the ship is assigned to Captain Christopher Pike.
2256-2257
The events of Star Trek: Discovery season 1 take place. The Klingon-Federation War.
2257
The events of Star Trek: Section 31 take place.
2257-2258
The events of Star Trek: Discovery season 2 take place. The USS Discovery and USS Enterprise (NCC-1701) engage in a pitched battle to neutralise the rogue AI Control. The battle is a success, but the Enterprise falsely reports that the Discovery was lost with all hands, to conceal the fact that it traveled 930 years into the future in order to prevent Control from reasserting itself. The Enterprise subsequently undergoes repairs and departs for Edrin II 4 months later.
2258 (alternate timeline)
The events of Star Trek take place. Nero destroys the planet Vulcan – killing billions, including Spock's mother – as well as nine Federation starships. The USS Enterprise (NCC-1701) is built in the state of Iowa and is launched on its maiden voyage under Captain Christopher Pike. James T. Kirk becomes the ship's new captain shortly afterward.
The events of Star Trek: Bridge Crew take place. The USS Aegis is searching for a new homeworld for the Vulcans after the destruction of their planet. The ship heads for a region of space called 'The Trench', which is being occupied by Klingons.
The events of Star Trek (2013 video game) take place. Captain Kirk, Spock, and the crew of the USS Enterprise encounter a powerful alien race known as the Gorn.
2259 (alternate timeline)
Some time prior to this point in the Kelvin timeline, the Federation black ops unit Section 31 revives Khan Noonien Singh from suspended animation on the Botany Bay, forcing him to undergo plastic surgery and work as a Section 31 agent under the identity of "John Harrison".
The events of Star Trek Into Darkness take place. Khan is returned to suspended animation on Earth as punishment for acts of terrorism.
2259
The events of Star Trek: Strange New Worlds season 1 take place.
The Enterprise begins another five-year mission under Christopher Pike.
2260 (alternate timeline)
The Enterprise is launched on a historic five-year mission.
2263 (alternate timeline)
Space Station Yorktown is established by Commodore Paris.
The events of Star Trek Beyond take place. The USS Enterprise is destroyed; USS Enterprise-A is commissioned at Starbase Yorktown as its replacement.
Ambassador Spock from the Prime Universe dies in the Kelvin Universe.
2261–2264
The USS Enterprise (NCC-1701) undergoes a major refit, increasing its crew complement from 203 to 430.
2311
The Tomed Incident.
2319
Gary Seven is born.
2320
Bolians join the Federation.
2324
Beverly Howard (Crusher) is born in Copernicus City, Luna.
2337
Tasha Yar is born in a failed Federation colony on Turkana IV.
2341
Julian Bashir is born.
2343
The Galaxy class development project is officially given the greenlight by Starfleet Command.
Due to the Enterprise-Cs sacrifice, a new era of more open communication begins between the Federation and the Klingon Empire, leading to a formalized alliance.
In the alternate timeline where Enterprise-C is not destroyed, the Klingons fight a long, destructive war against the Federation.
2345
Sela (half-Romulan/half-Human), daughter of Natasha Yar (alternate reality from "Yesterday's Enterprise"), is born.
2346
Worf's parents are killed by Romulans in the Khitomer massacre. Worf (age 6) is adopted by human parents.
2349
Annika Hansen is born in Tendara Colony to Magnus and Erin Hansen.
2355
Magnus, Erin, and Annika Hansen are assimilated by the Borg while on a research mission in the Delta quadrant.
The USS Stargazer is attacked by an unknown vessel (later discovered to be Ferengi in origin) in the Maxia Zeta system. Jean-Luc Picard wins the confrontation by devising a tactic which becomes known as the Picard Manoeuvre. However, due to damage suffered during the battle, the crew are forced to abandon ship. The Stargazer is later recovered in 2364.
2357
Worf is the first Klingon to enter Starfleet Academy. Dialogue in this film and in the DS9 finale "What You Leave Behind" place the chronology of this film as during that episode, after the final battle of the war but before the treaty signing ceremony. Most notable in the film is Worf's ability to leave the station to join the Enterprise, as well as a line about Federation diplomats being involved in Dominion negotiations, and the Federation's willingness to work with the Son'a, who are established as a Dominion ally during the war.
2378
With the help of Admiral Janeway from an alternate timeline in which the ship's return is delayed many years with tragic results, the USS Voyager returns to the Alpha Quadrant. ("Endgame"). Tom Paris' and B'Elanna Torres's daughter is born. At some point after returning home (and prior to the events of Star Trek: Nemesis), Janeway is promoted to Vice Admiral in the main timeline.
2379
The events of Star Trek: Nemesis, resulting in the death of Lieutenant Commander Data.
Discovery of previously unknown android named "B-4", a prototype android similar in design to Lt. Commander Data but with a notably less advanced positronic network.
2380-2381
The events of Star Trek: Lower Decks.
2383
The events of Star Trek: Prodigy.
2385, First Contact Day
The events of Star Trek: Short Treks episode "Children of Mars" take place. The Utopia Planitia Fleetyards on Mars are sabotaged and subsequently destroyed by rogue synthetics in a surprise attack. The battle results in the loss of 92,143 lives, the planet itself being considered destroyed, its stratosphere ignited, and the destruction of the rescue armada to evacuate Romulus. In the aftermath of the attack, the Federation, unable to determine how or why the synths went rogue, bans the creation of synthetic liveforms
2386
Lieutenant Icheb is captured and stripped for his Borg parts by Bjayzl, and subsequently euthanized by Seven of Nine.
2387
A star in the Romulan Empire goes supernova. Ambassador Spock attempts to counter the resulting shockwave using Red Matter, but is unable to save the planet Romulus from destruction. Spock and the Romulan mining ship Narada, commanded by Nero, are dragged into a black hole created by the Red Matter detonation and arrive in the past. Nero's arrival in 2233 and subsequent attack on the USS Kelvin creates the Kelvin Timeline. (Star Trek (2009))
2394 (alternate timeline)
Voyager returns to the Alpha Quadrant in the beginning of Star Trek: Voyager series finale ("Endgame"). This sets in motion events in which Kathryn Janeway becomes dissatisfied and begins laying plans to eventually change the timeline and send Voyager home sooner.
2395 (alternate timeline)
The "future" in the Star Trek: The Next Generation series finale "All Good Things...".
2399
The events of Star Trek: Picard season 1.

25th century

2401-2402
The events of Star Trek: Picard seasons 2-3.
2402
USS Titan (NCC-80102-A) is renamed USS Enterprise (NCC-1701-G) under the command of Captain Seven of Nine.
2404 (alternate timeline)
The original timeline split in the Star Trek: Voyager series finale ("Endgame"), where Admiral Janeway goes back 26 years to the Delta Quadrant and secures Voyagers earlier return to the Alpha Quadrant. This begins a new timeline (as yet unnamed).
2409-2412
The events of Star Trek Online .

26th century

c. 2540–2550 (alternate timeline)
The Starship Enterprise-J (presumably NCC 1701-J) is commissioned and takes part in the Battle of Procyon V against the Sphere Builders as shown in Enterprise episode "Azati Prime". As the events of the episode “Zero Hour” result in the destruction of the spheres and the dissipation of the altered space, it is likely this battle occurs only in an alternate timeline.

27th century

Temporal Cold War (with agents from the 31st century); first established in the pilot episode of Star Trek: Enterprise and recurring until the series' fourth season premiere, it is a struggle between those who would alter history to suit their own ends and those who would preserve the integrity of the original timeline.
With the distance between them having expanded over the centuries and making travel increasingly difficult, the last crossing between the Prime and Mirror Universes occurs at some point during this century.

29th century

The Aeon-type timeship is in active service during this century ("Future's End"), as is the Wells-class timeship Relativity ("Relativity").

30th century

Around the year 2958, supplies of Dilithium in the Milky Way started to dry up, marking the beginning of an energy crisis. The United Federation of Planets began development and trials of alternatives to warp drive, though none proved to be reliable.
The Federation spends much of this century engaged in a temporal war with the objective of upholding the Temporal Accords to ensure the timeline remains unaltered.

31st century

3069
A cataclysmic galaxy-wide event referred to as "The Burn" occurs. Nearly all Dilithium in the galaxy suddenly goes inert, causing a massive loss of life and the destruction of every ship and facility with an active warp core. In the aftermath, the remaining Dilithium became an ever more scarce resource. With few ships and warp travel severely impeded, no explanation for what happened and the uncertainty if it will happen again, the United Federation of Planets, Starfleet Command, and the United Earth, effectively collapse.
3074
The main plot of the Star Trek: Voyager episode "Living Witness" takes place, and the final scene takes place "many years" after that.
3089
The Federation, Starfleet Command and United Earth leave planet Earth for a new headquarters location. Around the same time, the United Earth government withdraws Earth from the Federation, becoming fully self-sufficient and isolating multiple planets from the rest of the galaxy.
Episodes with time traveler Daniels from Enterprise: "Cold Front", "Shockwave", "Azati Prime"

32nd and 33rd centuries

3186
This is the year Gabrielle Burnham arrived in after using the Red Angel suit to escape a Klingon attack on her home. (Discovery S2 E10)
3188-3191, ca. 3225
The events of Star Trek: Discovery seasons 3 to 5.
3195
The events of Star Trek: Starfleet Academy season 1.

34th century

3374 (alternate timeline)
According to Obrist, if the Krenim weapon ship continued to alter time to this point, full restoration of the Krenim Imperium would not have been achieved.

Far future

The events of the Star Trek: Short Treks episode "Calypso" take place in the 43rd century or later.

60-70 trillion years
The Universe will collapse.

History of the chronology (historiography)

Several efforts have been made to develop a chronology for the events depicted by the Star Trek television series and its spin-offs. This matter has been complicated by the continued additions to the Star Trek canon, the existence of time travel and multiple concurrent timelines, and the scarcity of Gregorian calendar dates given in the show (stardates instead being used).

Original series

Not many references set the original series in an exact time frame, and those that exist are largely contradictory. In the episode "Tomorrow Is Yesterday", a 1960s military officer says that he's going to lock Captain Kirk up "for two hundred years", to which Kirk replies, with wry amusement: "That ought to be just about right." Likewise, in the episode "Space Seed", it is said that the 1996 warlord Khan Noonien Singh is from "two centuries" ago. Both these references place the show in the 22nd century. However, in the episode "Miri", it is said that 1960 was around 300 years ago, pushing the show into the 23rd century. Finally, the episode "The Squire of Gothos" implied that the light cone of 19th century Earth has expanded to 900 light years of radius, which seems to set the show in the 28th century, since light would take nine centuries to traverse that distance.

According to notes in The Making of Star Trek, the show is set in the 23rd century, and the Enterprise was supposed to be around 40 years old. Roddenberry says in this book that the stardate system was invented to avoid pinning down the show precisely in time frame. Roddenberry's original pitch for the series dated it "'somewhere in the future. It could be 1995, or maybe even 2995".

Early chronologies

The Star Trek Spaceflight Chronology and FASA, a publisher of the first licensed Star Trek role-playing game, chose to take the "Space Seed figure", adding a few years to make sure the events of the Original Series were in the 23rd century. This dating system is followed by other spin-off works in the 1980s, including Mr. Scott's Guide to the Enterprise. This timeline system gives the following dates

The sub-warp ship the UNSS Icarus makes first contact with Alpha Centauri in 2048, and there meets Zefrem Cochran [sic], who has invented warp drive. The pilot episode, "Encounter at Farpoint", also has a cameo appearance by Leonard "Bones" McCoy, who is said to be 137.

In the last episode of the first season, the year is firmly established by Data as 2364. A second edition was issued in 1996. Okuda originally drew up a timeline for internal use by writers, based on his own research and assumptions provided by Richard Arnold. The dates in the Chronology are consistent with the earlier Star Trek: The Next Generation Technical Manual.

It gives the following dates:

Zephram Cochrane invents warp drive around 2061 (so that the SS Valiant can be constructed and go missing two hundred years before "Where No Man Has Gone Before", dated to 2265; the first edition gives 2061; the second edition moves this to 2063 per Star Trek: First Contact).
The Romulan War takes place in the 2150s (about a hundred years before "Balance of Terror").
The Federation is formed in 2161, after the Romulan War, on the basis that "Balance of Terror" says that it was an Earth-Romulan war, not a Federation-Romulan War.
The first Constitution-class starship is launched in 2244, followed by the Enterprise in 2245.
Kirk's five-year mission lasts from 2264 to 2269, based on the assumption that the original series is set exactly 300 years after its original broadcast.
Aired live-action Star Trek episodes are dated from 2266 to 2269. The chronology does not include the events of Star Trek: The Animated Series. This is in keeping also with Gene Roddenberry's concept (discussed in The Making of Star Trek by Roddenberry and Stephen Whitfield) that Star Trek's first season takes place after the mission has been under way for some time.
An episode of Voyager, "Q2", aired after the Chronology was published, established that Kirk's five-year mission actually ended in 2270.
The events of Star Trek: The Motion Picture take place in 2271 (Kirk has been Chief of Starfleet Operations for years, according to dialog from Kirk and Decker).
The "Q2" dating for Kirk's five-year mission, moves the first film to c. 2273.
Numerous sources, including the Chronology, postulate a second five-year mission under now-Admiral Kirk's command, begun soon after the events of the first movie; in part this is to take into account the unproduced revival series Star Trek: Phase II.
The events of Star Trek II: The Wrath of Khan and Star Trek III: The Search for Spock take place in 2285.
The Wrath of Khan is a sequel to the episode "Space Seed", which Okuda dates to 2267. In Okuda's timeline there is a gap of eighteen years rather than the fifteen years established in dialog. The film was released in 1982, fifteen years after the episode's broadcast in 1967. The film begins on Kirk's birthday, which is semi-canonically established as March 22, the same as William Shatner's.
The events of Star Trek IV: The Voyage Home take place in 2286.
This places Star Trek III in late 2285, as Kirk states in his log that the Enterprise crew has been on Vulcan for "three months" since bringing Spock home.
The events of Star Trek V: The Final Frontier apparently take place soon after the events of the fourth film, as evidenced by Scotty's complaints about repairing the ship after its shakedown cruise, which was depicted at the end of Star Trek IV. Star Trek V would then take place in early 2287.
The events of Star Trek VI: The Undiscovered Country take place in 2293, based on McCoy's statement that he had served on the Enterprise for 27 years, and his absence in "Where No Man Has Gone Before".
The Kirk-era part of Star Trek Generations is set 78 years before 2371 (established by way of an on-screen caption), thus is set in 2293 and soon after Star Trek VI.

The gap between the 1986 film Star Trek IV: the Voyage Home (2286) and the 1987 first season of The Next Generation (2364) is 78 years by this timeline, matching early press materials.

A gap of 10 years passed between the broadcast of the last episode of Star Trek: The Original Series and the release of The Motion Picture. The film skirted around the fact the actors had aged, supposing that only years had passed since the events of the TV show. For Star Trek II, it was decided to acknowledge the reality of the aging actors, both by setting the film some 15 years after "Space Seed", and by having Kirk worry about getting old.

Within The Next Generation era, episodes and films are easier to date. Stardates correspond exactly with seasons, with the first two digits of the stardate representing the season number. Okuda assumes the start of a season is January 1 and the end of the season is December 31. This timeline has The Motion Picture in 2273, to account for the two-and-a-half-year gap between the end-date of 2270 established in "Q2" and the events of the movie. The official website, StarTrek.com, still gives the date of that movie as 2271.

Eugenics Wars and World War III

When the original series of Star Trek was produced, the 1990s were several decades away, and so various elements of the backstory to Star Trek are set in that era, particularly the Eugenics Wars. The references to the Eugenics Wars and to a nuclear war in the 21st century are somewhat contradictory.

The episode "Space Seed" establishes the Eugenics Wars, and has them lasting from 1992 to 1996. The Eugenics Wars are described as a global conflict in which the progeny of a human genetic engineering project, most notably Khan Noonien Singh, established themselves as supermen and attempted world domination. Spock calls them "the last of your so-called World Wars", and McCoy identifies this with the Eugenics Wars.

In the episode "Bread and Circuses", Spock gives a death toll for World War III of 37 million. The episode "The Savage Curtain" features a Colonel Phillip Green, who led a genocidal war in the 21st century. The TNG episode "Encounter at Farpoint" further establishes a "post-atomic horror" on Earth in 2079. However, the movie Star Trek: First Contact put the contact between Vulcans and humans at April 5, 2063.

The Star Trek Concordance identifies the "Bread and Circuses" figure as the death toll for a nuclear World War III, in the mid-21st century. Star Trek: First Contact firmly establishes World War III ended, after a nuclear exchange, in 2053, but with a body count of 600 million. The figure of Colonel Green is elaborated on in Star Trek: Enterprise. First Contact also deliberately describes the warring parties in World War III as "factions", not nations per se.

The Voyager episode "Future's End" saw the Voyager crew time-travel to Los Angeles in 1996, which, as the Encyclopedia notes, seems entirely unaffected by the Eugenics Wars, which ended that year. The episode acknowledges the issue only by featuring a model of Khan's DY-100-class ship on a 1996 desk. Khan's spaceship is another anomaly for the timeline, which has a variety of long-lost spaceships being launched between 1980 and 2100, with inconsistent levels of technology (caused by the increasing real lifetime and also decreased optimism about the pace of space exploration).

A reference in the Deep Space Nine episode "Doctor Bashir, I Presume?" suggests that the Eugenic Wars instead took place in the 22nd century. According to writer Ronald D. Moore, this was not an attempt at a retcon, but a mistake – when writing the episode, he recalled the already questionable "two centuries ago" line from "Space Seed" and forgot that DS9 takes place over 100 years later.

Season 4 of Star Trek: Enterprise involves a trilogy of episodes ("Borderland", "Cold Station 12", and "The Augments") related to scientist Doctor Arik Soong, ancestor of Doctor Noonien Soong, and his genetic augmentations of Humans. Numerous historical details of the devastating Eugenics Wars are discussed: the death of 35–37 million people; how Earth's governments could not decide on the fate of the 1,800 genetically enhanced embryos; and how Soong had infiltrated the complex and stolen and raised 19 embryos himself. Soong maintained that he himself and humanity in general had learned the lessons of the Eugenics Wars and should not continue to hide behind those events when there was progress to be made now that the technology had matured and was much more practicable. (The actions of his "children" convince him otherwise, and at the end of "The Augments" Soong declares his interest in cybernetics, beginning the work which would one day bring about Data.)

Greg Cox's two-book series The Eugenics Wars: The Rise and Fall of Khan Noonien Singh develops the idea of the Eugenics Wars in the context of real-life history by representing it as a secret history, and that the truth behind the various civil wars and conflicts in the 1990s was not generally known; Los Angeles, whose appearance in "Future's End" helped bring the war's existence into question, is portrayed as an EW "battlefront", the Rodney King riots being one such calamity.

The series Star Trek: Strange New Worlds, which first aired in spring 2022, complicates the timeline further by retconning certain dating aspects by explicitly dating the Eugenics Wars to the first half of the 21st century. For example, the episode "Tomorrow and Tomorrow and Tomorrow" features a young Khan Noonien-Singh, long before his insurrection, and is set in the 2020s, and in the series premiere "Strange New Worlds", Christopher Pike describes footage from real-life events from 2020 and 2021 as the prelude to the second American Civil War and leading up to the Eugenics Wars and World War III. This differs from "Space Seed" asserting that not only did the Eugenics Wars take place in the mid-1990s but dialogue indicates that they were either concurrent with or simply were World War III. A character in "Tomorrow and Tomorrow and Tomorrow" says that events that were "supposed to happen back in 1992" instead occurred in the 2020s due to temporal wars and other manipulation of events.

Cochrane

In the episode "Metamorphosis", it is stated that Zefram Cochrane of Alpha Centauri, the discoverer of the space warp, disappeared 150 years ago, at the age of 87. Based on the 2207 to 2212