Timeline - 2100S

2100s

Year

Event

2102

•1	Ambassador Soval fires a weapon for the last time prior to 21521
•2	The Klingon, Kolos, becomes an advocate.3

2103

•4	Mars is colonized by Earth.4
•5	The ECS Horizon is built. It is rumoured that Zefram Cochrane signed the casing of the warp reactor.5
•6	A Vulcan ship discovers Berengaria VII. The crew's report includes the discovery of fire breathing flying reptiles more than 200 metres in length. This is rather doubted by many on Vulcan7, though the report is in fact accurate.8

2105

•9	Eight women are knifed to death by an unknown assailant on the Martian colony. The murders go unsolved until it is later found that Redjac committed them.9
•10	The Vulcan and Andorians agree a territorial compromise over the planet Weytahn / Pan Mokar. Despite the agreement tensions remain high and the two sides almost go to war twice over the next 92 years.10

2110s

Year

Event

2113

•11	A World government is formed on Earth.11

2114

•12	Phlox becomes a doctor12

2119

•13	The Warp 5 complex is founded on Earth, dedicated to building a warp engine capable of reaching over one hundred times the speed of light. Zefram Cochrane, now a resident of Alpha Centuri, departs on a trip into deep space afterwards. He vanishes, and is eventually presumed to have died in space.14

2120s

Year

Event

2121

•15

Warp specialist Henry Archer enjoys a day at the beach with his son Jonathan, teaching him to fly a remote controlled model spacecraft. Archer imparts the lesson that Jonathan must not be afraid to take on the elements when flying, advice that he would remember as Captain of the NX-01 thirty years later.14

2122

•16	The Vulcan Ministry of Security sends agents to infiltrate the criminal syndicates on the planet Agoran at the request of the government. Some of the agents will later refuse to return to Vulcan, though all will eventually be recaptured.16
•17	T'Pau is born.17

2123

•18	Spacecraft SS Mariposa is launched. The craft carries two groups of colonists bound for the Ficus sector. It settles colonies on Bringloid V and Mariposa, where it crashes on landing leaving only five survivors.18

2126

•19	Travis Mayweather is born19

2128

•20	T'Pol undergoes a dental procedure to seal her teeth with tri-fluorinate compound. Despite the treatment, some decay will appear by 2151.20

2129

•21	Hoshi Sato is born on 9th July, the second child in a family of three.22

2130s

Year

Event

2130

•23	A Kantare ship is disabled by an Ion storm and crash-lands on an uninhabited class M planet. Only two people survive the crash, Chief Engineer Ezral and his daughter Liana. They remain on the planet until 2152.23

2132

•24	Thirty Paraagans establish a mining colony on a class M planet. The colony will grow to 3,600 people by 2152.24
•25	The Klingon advocate, Kolos, begins serving in one of the courts on a Klingon world. He will remain in the same post for the next twenty years.3

2133

•26	A Klingon ship emerges from the Delphic Expanse, the crew still alive despite having been anatomically inverted. Even in 2153 Klingons will still fear the Expanse because of this incident.26
•27	Dr. Arik Soong steals a number of genetically engineered embryos from Cold Station 12.28

2135

•	Lela dies. The Dax symbiont is joined to Tobin. He subsequently becomes a mathematician and engineer.29
•30	T'Pol graduates from the Vulcan Ministry of Security. Her first assignment is to capture seven Vulcan agents who have refused to leave the planet Agoran. T'Pol captures five of the agents, and is forced to kill the sixth. The seventh, Menos, escapes. Guilty at her actions, T'Pol leaves the Ministry of Security and spends time at the monastery on P'Jem.30

2136

•31	Captain Vanik becomes Captain of the Ti'Mur.31

2137

•32	An artifact is uncovered on Vulcan by Syrran. The artifact bears Surak's katra, which Syrran is able to recover.32

2140s

Year

Event

2142

•33	Shran gains command of the Kumari, an Andorian warship.34

2143

•35	Archer meets Trip for the first time whilst serving as an engineer on the NX test program.35
•36	Archer becomes the pilot of the second successful warp 2 flight. Although the flight is unauthorised and takes place over the objections of the Vulcan advisors, the success leads to the engine design being approved for further development.36

2144

•37	Reed attends a family reunion - his last until at least 2153.37
•38	Phlox speaks to his son Mettus for the last time prior to 2153, the two having fallen out over Phlox's attitude towards the Antarans.38
•39	The Vulcan ship Vahklas leaves the planet with a group of V'tosh ka'tur - 'Vulcans without logic' - who are experimenting with creating a new lifestyle for themselves.39
•40	The Suliban begin to launch a series of attacks against the Tandarans.40
•41	Dr. Arik Soong is captured and imprisoned. He refuses to say what he did with the genetically engineered embryos he stole from Cold Station 12 more than a decade before.28

2145

•42	A Xindi insectoid born in this year will be killed when his ship crashes in 2154.42
•43	The Borg assimilate Species 262, a primitive species which posessed some legends of a substance which could burn the sky. The Borg followed this trail to a dozen other species, eventually discovering the Omega molecule.43

2147

•44	Starfleet begins working on a method of generating a forcefield barrier.44
•35	Archer saves Trip's life.35

2149

•45	T'Pol moves to Earth as part of the Vulcan diplomatic mission on the planet.45
•46	Mayweather leaves the ECS Horizon so he can join Starfleet.46
•47	Phlox sees his second wife, Feezal, for the last time prior to 2152.47

2150s

Year

Event

2150

•48	Australia joins Earth's world government, the last nation state to do so.48
•49	Captain Archer requests a personal evaluation from the former commanding officers of the candidates he is reviewing for the position of helm officer. Ensign Mayweather's father responds with a single line claiming that his son is the most natural rudder and stick man he has ever known, and Archer would be a fool not to select him. The letter wins Mayweather the post.49

2151

•14	Archer becomes captain of Enterprise, NX-01, the first Human warp 5 capable vessel. His crew includes Trip Tucker as Chief Engineer, Reed as Armoury Officer, Mayweather as Helmsman, T'Pol as Science officer, Phlox as Chief Medical officer, and Hoshi as Linguist and Communications officer.14
•35	Enterprise embarks on its maiden voyage, returning the Klingon Klaang to his home world. This marks the first contact between Humanity and the Klingons. Although apparently successful at the time14, the contact ultimately proves disastrous and leads to decades of hostilities between the two powers.50
•51	The NX-01 makes first contact with the Axanar.51
•14	Trip becomes the first Human male to become pregnant after an encounter with a Xyrillian woman.35
•52	Enterprise travels to Terra Nova, Earth's first extrasolar colony, and contacts the descendants of the original colonists.52
•53	Archer reveals the existence of a secret Vulcan intelligence installation beneath the Vulcan monastery at P'Jem to the Andorians. Shortly afterwards they destroy both the monastery and the base beneath.53
•54	Enterprise rescues a Klingon scoutship from a gas giant planet. The action does little to endear the crew to the Klingons.54
•55	Silik infiltrates the NX-01 whilst it is observing the great Plume of Agosoria. He sabotages the ship in order to save it from an accident which would otherwise have destroyed it. Archer attempts to capture Silik with the assistance of Daniels, but fails.55
•56	The NX-01 encounters a group of Vulcans who believe in experiencing emotions. T'Pol is forced to undergo a mind meld by one of the group, contracting Pa'nar Syndrome in the process.56
•57	The NX-01 encounters a rogue planet drifting between star systems. First contact with both the Eska and Wraiths on the planet.57
•58	The NX-01 recovers Vulcan ambassador V'Lar from the planet Mazar and returns her to a Vulcan ship, in spite of some resistance from the Mazarites.58

2152

•59	The NX-01 Enterprise visits Risa, the first Human vessel to do so. Half of the crew have the opportunity to enjoy two days and nights of shore leave on the planet.59
•60	Enterprise wanders into a cloaked minefield; first contact between Humanity and the Romulan Star Empire.60
•61	The NX-01 visits the Kretassian homeworld. Despite some minor diplomatic embarrasments, the visit is ultimately successful.61
•62	T'Pau travels to the T'Karath sanctuary in The Forge. She remains here continuously for at least the next two years.62
•63	First contact with the Takret. The crew of the NX-01 are forced to shelter in the ship's nacelles when an energy storm threatens the ship. The Takret military makes an unsuccessful attempt to steal the ship during the storm.63
•64	The NX-01 visits Dekendi III for an inter-species medical conference. Phlox attempts to gain access to information concerning Pa'nar Syndrome in order to facilitate his treatment of T'Pol. The attempt fails, and T'Pol is almost expelled from the High Command for participating in a mind meld. When it is revealed that the meld was against her will, she is allowed to retain her post.64
•65	Captain Archer negotiates a ceasefire between the Vulcans and Andorians, resolving the Weytahn / Pan Mokar crisis.65
•66	The NX-01 apparently causes the destruction of a Paraagan mining colony with the loss of over 3,000 lives. Captain Archer is able to prove that the Suliban actually caused the explosion. Captain Archer is taken into the future by Daniels; the NX-01 is subsequently captured briefly by the Suliban, but escapes with archer's help.66
•67	The NX-01 discovers a disabled vessel drifting in space. The ship proves to be from the future; in spite of considerable interference from the Tholians and Suliban, Archer is successful in returning the vessel to its rightful owners.67
•3	Captain Archer is captured by the Klingons and charged with assisting a group of rebels. Convicted, he is sent to Rura Pente but subsequently escapes thanks to some bribery by the NX-01 crew.3

2153

•68	Travis Mayweather visits his home ship, the ECS Horizon, for the first time since leaving to join Starfleet. He is saddened to learn of his father's recent death.68
•69	A group of Borg which have been frozen on Earth's polar region since being destroyed by the Enterprise-E in 2063 are revived by a team which is investigating the debris. They assimilate the investigators and escape the planet, but are subsequently destroyed by the NX-0169
•70	A Xindi attack on Earth kills 7 million people, including Trip's sister Elisabeth. Enterprise is recalled and sent to the Delphic Expanse to investigate the origin of the Xindi weapon and prevent further attacks.70
•70	T'Pol resigns from the Vulcan High Command to take part in Enterprise's mission to the Delphic Expanse.70
•71	The Enterprise discovers the Vulcan ship Seleya adrift in the expanse, it's crew driven insane by the effects of Trellium-D. T'Pol also experiences the effects of the substance when she boards the ship71; she becomes a habitual user of it afterwards.72
•73	The NX-01 discovers a Xindi outpost which is assisting in the construction of the weapon intended to destroy Earth. Archer manages to convince the leader of the facility to sabotage his next shipment.73
•74	The NX-01 encounters a group of Humans who have lived on a planet in the Delphic Expanse for more than a centry after being abducted from Earth.74
•75	When Trip is badly injured in an accident, Phlox creates a replica of him from a Lyssarian desevae in order to harvest neural tissue, in spite of the fact that the replica is a sentient being who will be killed by the procedure. The replica, named Sim, enjoys a brief romantic attraction to T'pol before his death.75
•76	The prototype Xindi weapon fails a test firing thanks to the sabotage arranged by Captain Archer. Archer's attempt to steal the weapon fails, but he is able to acquire detailed scans of the device thanks to some help from Shran.76
•77	The NX-01 discovers a sentient being adrift in a pod within a super-anomaly. This marks first contact with the Sphere Builders.77

2154

•78	The NX-01 is badly damaged by the Xindi whilst attempting to destroy the final version of the weapon at Azati Prime. Thanks to Daniels' intervention, Archer is able to convince Degra that Humanity may not be responsible for the destruction of the Xindi Homeworld in the future.78
•79	Hoshi is kidnapped by the Xindi Reptillians.80 Major Hayes is killed during a successful rescue attempt by the MACOs.79
•81	Captain Archer destroys the Xindi weapon as it approaches Earth.81
•81	NX-01 Enterprise destroys the sphere network maintaining the Delphic Expanse.81
•81	In the aftermath of the defeat of the Sphere Builders, the NX-01 is returned to Earth by the Xindi. As the ship arrives it is sent into the past82 by Daniels in order to combat the Na'kuhl's disruption of Earth's timeline. Daniels is killed in the process by unknown causes. Unknownst to the crew, Silik stows away on the ship when it travels to 1944.82
•83	The NX-01 returns from 1944 safely, having defeated the Na'kuhl and ended the Temporal Cold War. The destruction of the Na'kuhl time machine restores the timeline, resurrecting Daniels.83 Silik is killed in the past during the mission.84
•28	A group of genetically engineered Humans steal a Klingon bird of prey, murdering the crew in the process. The NX-01 is sent to capture the Augments. During the mission, several of the crew are captured by Orion slavers but subsequently rescued successfully.28
•85	The Augmented Humans assault Cold Station 12, stealing samples of various deadly diseases.85
•86	Captain Archer is able to destroy the stolen Bird of Prey, killing the Augments.86
•87	The Earth embassy on Vulcan is badly damaged by a terrorist bomb, killing doezens of people - including Admiral Forrest. Although the Syrrannites are initially blamed87, it is discovered that administrator V'Las is actually responsible for the crime as part of his campaign to discredit and destroy the Syrrannites in preparation for his planned war against the Andorians.62 Although the attack on Andoria does begin, V'Las is deposed and the attack halted.88
•34	Shran's ship, the Kumari, is destroyed, apparently by a Tellarite ship. Further investigation reveals that the attacker was in fact a Romulan drone ship designed to mimic other vessels.34 Captain Archer is able to gather a multi-species fleet to track down the drone ship.89 He is ultimately able to destroy it.90
•91	The Klingons begin to experiment with captured DNA from Human Augments. An accidental by-product of the experiment is a deadly disease which spreads rapidly to large numbers of Klingons.91 Phlox is able to cure the lethal phase of the disease, but can do nothing about the early stages - a sympton of which is the loss of the characteristic Klingon forehead ridges. Many millions of Klinons are expected to lose their ridges over the following months.92
•7	The Orions attempt to capture the NX-01 by infiltrating the ship with three females. The attempt fails. Commander Tucker returns to the ship as Chief Engineer.7

2155

•93	John Frederick Paxton comandeers the Verteron array on Mars and attempts to use it to blackmail Earth into severing all relations with alien species.93 The attempt fails when Captain Archer infiltrates Paxton's ship.94
•95	Trip and T'Pol end their romantic involvement.95

2156

•96	Shran has a daughter, Talla, by a woman named Jhamel.96
•97	The Romulan War begins.97
•9	Two women are knifed to death in Heliopolis City on Alpha Eridani II. Unsolved at the time, it is later discovered that the entity known as Redjac committed them.9

2158

•98	Shran fakes his own death.98

2160s

Year

Event

2160

•99	Romulan War ends.99
•100	Shran is found to still be alive by the criminal gang he was hiding from.100

2161

•101	Charles Tucker dies, sacrificing himself to defeat a criminal gang who boarded the Enterprise.101
•102	The United Federation of Planets is formed by the Human, Vulcan, Andorian and Tellarite governments.78

2164

•103	The drug felicium is used to stop a plague on the planet Ornara. The medicine proves to be powerfully addictive, and the whole population of Ornara become addicts.103

2165

•104	Sarek is born on the planet Vulcan.104
•105	Guinan had her last encounter with Q prior to 2365.105
•106	Planet Deneva is colonised by the Federation. It is held by many to be one of the most beautiful planets in the galaxy.106

2167

•107	The Starship Archon visits the planet Beta III in the C-111 system. The ship is destroyed by Landru, the planets controlling computer system.107
•108	The USS Essex is destroyed in an electromagnetic storm above a Class-M moon orbiting Mab-bu VI. The entire crew of 229 is lost.108
•109	Hoshi Sato leaves Starfleet.110

2168

•111	The Starship Horizon visits Sigma Iotia II, a planet lying about one hundred light years beyond Federation space. The crew leaves behind a copy of the book Chicago Mobs of the Twenties; unfortunately the natives come to regard the book as a blueprint for the ideal society. They subsequently remould their world into a close approximation of the book.111
•112	Settlers from Earth establish a colony on the planet Moab IV. They create a sealed biosphere in which they plan to create an ideal society using genetic engineering.112

2169

•113	A new type of impulse engine is adopted. The basic design of impulse drive remains unchanged for at least two centuries.113
•114	Jonathan Archer becomes Ambassador to Andoria.22

2170s

Year

Event

2170

•115	The Kavis Alpha neutron star explodes. This phenomena repeats itself every 196 years, and will occur again in 2366 when the Enterprise-D will be present to observe it.115
•116	A group of Native Americans seek to preserve their cultural identity by leaving Earth to establish a home elsewhere.116

2172

•117	Bajoran poet Akorem Laan is thought lost whilst on an interplanetary journey. He actually stumbles into the Bajoran Wormhole.117
•118	The Dominion inflict the planet Teplan with a disease known as the Blight.118

2175

•114	Jonathan Archer steps down as Ambassador to Andoria and is elected as a Federation Councilman.22

2180s

Year

Event

2183

•114	Jonathan Archer steps down as a Federation Councilman.22

2184

•114	Jonathan Archer becomes President of the United Federation of Planets.114

2190s

Year

Event

2192

•114	Jonathan Archer steps down as Federation President after eight years.22

2196

•108	The last Daedalus class Starship is withdrawn from service.108

Yellow text = Canon source

Green text = Backstage source

White text = DITL speculation

References

#	Series	Season	Source	Comment
1	ENT	2	Cease Fire	Soval says he has not fired a weapon in 50 years
2	ENT	2	Judgment	Kolos said he had been an advocate for 50 years
3	ENT	2	Judgment
4	VOY	2	The 37's
5	ENT	2	Horizon	The ship is said to be 50 years old
6	ENT	4	Bound	T'Pol said this happened over 50 years ago - this is 51 years before the episode.
7	ENT	4	Bound
8	TOS	1	This Side of Paradise
9	TOS	2	Wolf in the Fold	said by computer
10	ENT	2	Cease Fire	The agreement is said to have taken 8 years to agree
11			Star Trek : First Contact
12	ENT	3	Damage	Phlox says he has been a medic for 40 years
13	ENT	1	Broken Bow	At the Enterprise launching ceremony in 2151 the complex was stated to have been founded 32 years ago
14	ENT	1	Broken Bow
15	ENT	1	Broken Bow	Stated to be thirty years prior to the episode date of 2151
16	ENT	2	The Seventh	T'Pol says this happened 30 years ago. Note that she claimed to be too young to be one of the agents, though she was 34 at this time according to 'Zero Hour'. It may be that Vulcans of this period considered a person too young for responsibility until some time between 34 and 47, or it may be that T'Pol lied to conceal her true age.
17	ENT	4	The Forge	Phlox said that T'pau was 32 standard years old. I'm presuming standard years equates to Earth years.
18	TNG	2	Up The Long Ladder
19	ENT	2	Dead Stop	Phlox gives his age
20	ENT	1	Dear Doctor	T'Pol said the treatment was 23 years ago
21	ENT	4	In A Mirror, Darkly Part II	Visible on her onscreen biography
22	ENT	4	In A Mirror, Darkly Part II
23	ENT	1	Oasis	Said to have happened 22 years before the episode
24	ENT	1	Shockwave, Part 1	The colony was said to be 20 years old
25	ENT	2	Judgment	Kolos said he had been working in that court for 20 years
26	ENT	2	The Expanse	The incident was said to have happened 20 years ago
27	ENT	4	Borderland	Said to have happened more than 20 years ago - this is 21 years.
28	ENT	4	Borderland
29	DS9	3	Facets
30	ENT	2	The Seventh	T'Pol describes the events which took place 17 years ago
31	ENT	1	Breaking the Ice	Vanik says he has been captain of the ship for 15 years
32	ENT	4	The Forge	A caption on the screen said this had happened seventeen years ago.
33	ENT	4	Babel One	Shran said this happened 12 years ago
34	ENT	4	Babel One
35	ENT	1	Unexpected
36	ENT	2	First Flight
37	ENT	2	Horizon	Reed says his last family reunion was almost a decade ago; this is 9 years before the episode
38	ENT	2	The Breach	Phlox says he has not spoke to his son in nearly ten years; this is 9 years before the episode
39	ENT	1	Fusion	Eight years before the episode
40	ENT	1	Detained	Said to have happened 8 years ago
41	ENT	4	Borderland	Archer said Soong was captured a decade ago
42	ENT	3	Hatchery	The Insectoid was said to be almost ten years old; this is 9 years before the episode
43	VOY	4	The Omega Directive	Seven said this happened 229 years before the episode
44	ENT	1	Vox Sola
45	ENT	1	Fusion	T'Pol says she lived on Earth for two years before going to Enterprise
46	ENT	2	Horizon	Reed says this happened four years ago
47	ENT	2	Stigma	Phlox says he has not seen his wife in nearly 4 years; this is three years before the episode
48	TNG	7	Attached
49	ENT	2	Horizon	Archer says this happened two and a half years ago
50	TNG	4	First Contact
51	ENT	1	Fight or Flight
52	ENT	1	Terra Nova
53	ENT	1	The Andorian Incident
54	ENT	1	Sleeping Dogs
55	ENT	1	Cold Front
56	ENT	1	Fusion
57	ENT	1	Rogue Planet
58	ENT	1	Fallen Hero
59	ENT	1	Two Days and Two Nights
60	ENT	2	Minefield
61	ENT	2	A Night In Sickbay
62	ENT	4	Awakening
63	ENT	2	The Catwalk
64	ENT	2	Stigma
65	ENT	2	Cease Fire
66	ENT	1	Shockwave, Part 1
67	ENT	2	Future Tense
68	ENT	2	Horizon
69	ENT	2	Regeneration
70	ENT	3	The Xindi
71	ENT	3	Impulse
72	ENT	3	Damage
73	ENT	3	The Shipment
74	ENT	3	Twilight
75	ENT	3	North Star
76	ENT	3	Proving Ground
77	ENT	3	Harbinger
78	ENT	3	Azati Prime
79	ENT	3	Countdown
80	ENT	3	The Council
81	ENT	3	Zero Hour
82	ENT	4	Storm Front, Part I
83	ENT	4	Home
84	ENT	4	Storm Front, Part 2
85	ENT	4	Cold Station 12
86	ENT	4	The Augments
87	ENT	4	The Forge
88	ENT	4	Kir'Shara
89	ENT	4	United
90	ENT	4	The Aenar
91	ENT	4	Affliction
92	ENT	4	Divergence
93	ENT	4	Demons
94	ENT	4	Terra Prime
95	ENT	4	These Are The Voyages...	T'Pol said this had been over for six years
96	ENT	4	These Are The Voyages...	Shran said this happened five years ago
97			Star Trek Chronology	second edition, page 32
98	ENT	4	These Are The Voyages...	Shran was said to have died three years ago
99			Star Trek Chronology	second edition, page 33
100	ENT	4	These Are The Voyages...	Shran said they had located him six months ago
101	ENT	4	These Are The Voyages...
102	TNG	5	The Outcast
103	TNG	1	Symbiosis	Two hundred years ago.
104	TOS	2	Journey to Babel
105	TNG	2	Q Who	Q said their dealings were two centuries ago
106	TOS	1	Operation: Annihilate!
107	TOS	1	The Return of the Archons
108	TNG	5	Power Play
109			Speculative	Hoshi's onscreen biography in "In a Mirror, Darkly, Part II" says this happened in her late thirties. She would be 38 at this point.
110	ENT	4	In A Mirror, Darkly Part II	Stated on her onscreen biography
111	TOS	2	A Piece of the Action
112	TNG	5	The Masterpiece Society
113	TNG	6	Relics
114	ENT	4	In A Mirror, Darkly Part II	Date shown on his onscreen biography
115	TNG	3	Evolution
116	TNG	7	Journey's End
117	DS9	4	Accession	Two hundred years ago.
118	DS9	4	The Quickening	Two hundred years ago.

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Last updated : 9 Apr 2013

Series:	ENT Season 2 (Disc 4)
Source:	Cease Fire
Comment:	Soval says he has not fired a weapon in 50 years

Series:	ENT Season 2 (Disc 5)
Source:	Judgment
Comment:	Kolos said he had been an advocate for 50 years

Series:	ENT Season 2 (Disc 5)
Source:	Judgment

Series:	VOY Season 2 (Disc 1)
Source:	The 37's

Series:	ENT Season 2 (Disc 5)
Source:	Horizon
Comment:	The ship is said to be 50 years old

Series:	ENT Season 4 (Disc 5)
Source:	Bound
Comment:	T'Pol said this happened over 50 years ago - this is 51 years before the episode.

Series:	TOS Season 2 (Disc 3)
Source:	Wolf in the Fold
Comment:	said by computer

Series:	ENT Season 3 (Disc 5)
Source:	Damage
Comment:	Phlox says he has been a medic for 40 years

Series:	ENT Season 1 (Disc 1)
Source:	Broken Bow
Comment:	At the Enterprise launching ceremony in 2151 the complex was stated to have been founded 32 years ago

Series:	ENT Season 2 (Disc 2)
Source:	The Seventh
Comment:	T'Pol says this happened 30 years ago. Note that she claimed to be too young to be one of the agents, though she was 34 at this time according to 'Zero Hour'. It may be that Vulcans of this period considered a person too young for responsibility until some time between 34 and 47, or it may be that T'Pol lied to conceal her true age.

Series:	ENT Season 4 (Disc 2)
Source:	The Forge
Comment:	Phlox said that T'pau was 32 standard years old. I'm presuming standard years equates to Earth years.

Series:	ENT Season 2 (Disc 1)
Source:	Dead Stop
Comment:	Phlox gives his age

Series:	ENT Season 1 (Disc 3)
Source:	Dear Doctor
Comment:	T'Pol said the treatment was 23 years ago

Series:	ENT Season 1 (Disc 5)
Source:	Oasis
Comment:	Said to have happened 22 years before the episode

Series:	ENT Season 1 (Disc 6)
Source:	Shockwave, Part 1
Comment:	The colony was said to be 20 years old

Series:	ENT Season 2 (Disc 7)
Source:	The Expanse
Comment:	The incident was said to have happened 20 years ago

Series:	ENT Season 4 (Disc 1)
Source:	Borderland
Comment:	Said to have happened more than 20 years ago - this is 21 years.

Series:	ENT Season 1 (Disc 2)
Source:	Breaking the Ice
Comment:	Vanik says he has been captain of the ship for 15 years

Series:	ENT Season 4 (Disc 3)
Source:	Babel One
Comment:	Shran said this happened 12 years ago

Series:	ENT Season 2 (Disc 6)
Source:	The Breach
Comment:	Phlox says he has not spoke to his son in nearly ten years; this is 9 years before the episode

Series:	ENT Season 1 (Disc 4)
Source:	Fusion
Comment:	Eight years before the episode

Series:	VOY Season 4 (Disc 6)
Source:	The Omega Directive
Comment:	Seven said this happened 229 years before the episode

Series:	ENT Season 4 (Disc 6)
Source:	These Are The Voyages...
Comment:	T'Pol said this had been over for six years

Series:	TNG Season 1 (Disc 5)
Source:	Symbiosis
Comment:	Two hundred years ago.

Series:	TNG Season 2 (Disc 4)
Source:	Q Who
Comment:	Q said their dealings were two centuries ago

Series:	TOS Season 1 (Disc 5)
Source:	The Return of the Archons

Series:	DS9 Season 4 (Disc 5)
Source:	Accession
Comment:	Two hundred years ago.

Series:	DS9 Season 4 (Disc 6)
Source:	The Quickening
Comment:	Two hundred years ago.