late February - early March 2152  Events of "Shockwave - Part II"

Intent on stopping Archer and Enterprise's mission, the diabolical Suliban take the crew hostage when it is discovered that Archer has mysteriously disappeared off the ship. 

While stuck in the decimated remains of the 31st century, Archer and Daniels work to find a way to get back to Enterprise; and Daniels worries that the future existence of The Federation may be in jeopardy as a result of his action to remove Archer from Enterprise, forever changing the course of history. 

  (more than 10 months after "Broken Bow")

Early March 2152 At the end of "Shockwave - Part II", Starfleet decides that the Enterprise should continue its mission to explore space.   The timeline with Daniel's utopian 31st century Earth is then presumably restored.

April 15, 2152  Events of "Carbon Creek"

T'Pol tells Archer and Trip a story about her great-grandmother T'Mir and three other Vulcans who made first contact with humans after crash landing in a small Pennsylvania town in the 1950s. T'Pol's story shocks Archer and Trip because her account is much earlier and very different from what history books reported.   

(Exactly one year since T'Pol officially joined the crew)

c. April 22, 2152 The Enterprise visits Tesik Prime, where one of the crew contracts Rigellian fever.  As a result of subsequent exposure, Dr. Phlox inoculates the crew.   (Date is speculation.  Event occurs one month prior to "Dead Stop")

c. May 8, 2152 Travis plays a practical joke on Hoshi by asking for her help communicating with a gelatinous lifeform which is, in fact, some strawberry gelatin.  (Date is speculation.  Event occurs two weeks prior to "Dead Stop") 

c. May 15, 2152 Captain Archer has to cancel his breakfast meeting with Travis (Date is speculation.  Event occurs one week prior to "Dead Stop")

c. May 18, 2152 Events of "Minefield"

After unwittingly wandering into a minefield in Romulan territory, Enterprise becomes trapped when struck by an undetonated mine. When Reed takes a space walk to try to defuse the mine, he inadvertently gets pinned to the outer hull and Archer must choose between saving Reed or abiding by the Romulans' orders to depart immediately.

(date speculation)

c. May 22, 2152  Events of "Dead Stop"

Enterprise, in desperate need of extensive repairs, docks with a mysterious, high-tech, automated space station that inexplicably and amazingly fixes everything, making it almost too good to be true. While waiting for the repairs to be completed, the Enterprise crew searches the unmanned space station and discovers its unique and horrifying power source.

(date is conjecture, four days after "Minefield")

c. May 29, 2152 Travis Mayweather finally meets Captain Archer for breakfast.

(about a week after "Dead Stop")

c. June 1, 2152 Events of "A Night in Sickbay"

Archer spends a fretful night in sickbay with Dr. Phlox after Porthos, Archer's pet beagle, picks up a deadly virus on an alien planet. Meanwhile, crew members believe Archer's increased stress level is due to Porthos' illness, but Dr. Phlox suspects it has to do with Archer's repressed sexual tension.

c. June 13, 2152 Events of "Marauders"

When Enterprise is in need of fuel, Archer discovers a desolate mining colony that is being controlled by Klingon marauders who are bullying the colonists and hoarding their fuel. After Archer discovers the problem, the crew trains the colonists to defend themselves and prepare for a final showdown against their Klingon oppressors.

(Date is conjecture - Archer states that it has been just over a year since events that took place in "Broken Bow", and 14 months seems about right..)

c. June 30, 2152 The Vulcan Ministry of Security tracks Menos to the Prenia system.   (just prior to "The Seventh")

July 1 to July 8, 2152 Events of "The Seventh"

T'Pol brings Archer with her on a top-secret mission when she is dispatched by the Vulcan High Command to capture a fugitive that has eluded their authorities for nearly two decades. Meanwhile, T'Pol reveals to Archer a dark and violent secret that she repressed, and Trip, who fills in for Archer while he is away, finds the weight of being the Captain hard to bear.

(Dates are conjecture.   Episode covered about nine days.)

July 17 - July 19, 2152 Events of "The Communicator"

Reed accidentally leaves his communicator on a pre-warp alien planet during a visit, and when he returns with Archer to retrieve the crucial technology, they are captured by soldiers who accuse them of being enemy spies. Meanwhile, Trip and Mayweather use the cloaking technology of the damaged Suliban Cell-Ship they had previously captured in an attempt to rescue Archer and Reed before they are executed.

(Dates are conjecture.   Episode covered about three days.)

c. July 20, 2152 The Enterprise visits a blue giant cluster with no inhabited planets - a nice change of place (subsequent to "The Communicator")

It was also around this time that the Denoblian geological team began its survey in caves on Zantorus. (six months prior to "The Breach")

August 2152? The Klingons surprise attack, conquer, plunder and then abandon an alien colony on their border.  The colonists later flee aboard a small vessel.   (speculation - six months before "Judgment")

August 12 - August 15, 2152 Events of "Singularity"

While checking out a trinary star system, on a "typical" day on Enterprise, the crew finds their routine tasks turn into uncharacteristically strange obsessions over trivial matters. The crew's increasingly erratic and often humorous behavior includes: Archer's preoccupation with writing the preface of a biography about his dad; Trip's fixation on adjusting the Captain's chair to perfection; Hoshi's obsession with her cooking; and Reed's concern with a Tactical Alert.

(Date of August 14 given in episode.  Dates include flashback sequences)

c.  August 28, 2152 Events of "Vanishing Point"

Following her first experience in the transporter, a series of eerie events leads Hoshi to question whether she is the same person. Feeling fearful and helpless, Hoshi becomes unsure of herself wondering if she is losing her mind, or if the transporter has somehow changed her, or if there is an alien threat behind all of these bizarre happenings suddenly taking place.

(Date is conjecture.   Entire episode took place within a single day.)

September 7, 2152 - September 12, 2152 Events of "Precious Cargo"

When Trip rescues an exotic alien woman from her kidnappers, they find themselves on the run from her captors and, in the process, on an unexpected romantic adventure. Meanwhile, Archer holds one of the alien kidnappers captive on Enterprise and devises a scheme with T'Pol's help to pressure the reluctant prisoner to help them locate Trip.

 (Date of September 12, 2152 is given in starlog entry at end of episode)

September 18, 2152 - September 26, 2152 Events of "The Catwalk"

When a deadly radioactive storm threatens Enterprise, the entire crew must take refuge for eight days in a small maintenance shaft. As they weather the storm, the crew discovers that alien intruders are trying to steal Enterprise — and may turn the crew's save haven into a death trap in the process. In order to stop the aliens and save the ship, Archer and his officers must battle against time ... and the deadly storm.

 (Date of September 12, 2152 is given in starlog entry at the start of the episode)

October 2152 Events of "Dawn"

Trip Tucker is alone on a test mission aboard Shuttlepod One when he is fired upon by a territorial alien and forced to land on the night side of a moon. As he tries in vain to contact Enterprise, he discovers his alien foe has also made an emergency landing nearby, and the two nemeses must contend with each other as the extremely hot rising sun threatens their survival.

(date is conjecture)

October 2152 Travis Mayweather's father, the Captain of the E.C.S. Horizon, gets ill.   Rianna, Travis' mom sends him a note letting him know.   

Paul Mayweather, Travis' younger brother, is made Acting Captain of the Horizon, at the age of 24.

(speculation of dates, based on "Horizon")

Late October 2152 Events of "Stigma"

While Enterprise visits a planet where an Interspecies Medical Exchange conference is taking place, Dr. Phlox tries to obtain research on a terminal disease from the Vulcan contingency there. But he must not reveal that T'Pol has contracted this disease, because that knowledge would forever stigmatize her among her people.  

(almost a year since "Fusion", which took place in November 2151)

Early November 2152 Events of "Cease Fire"

A military conflict erupts between the Vulcans and Andorians over a small terraformed planet that both sides make claim to. In the midst of the skirmish, the Vulcans announce they wish to discuss terms for a cease-fire, but Imperial Guard officer Shran believes the only one he can trust to mediate such a negotiation is Jonathan Archer, so the captain and his ship are called into the fray.

(Date is conjecture)

3 days before "Future Tense" the Suliban first detect the strange derelict.

November  2152 Events of "Future Tense"

Far beyond where any Earth vessel has ventured before, the Enterprise crew is shocked to find a small craft adrift in space that contains what appears to be a human corpse. Trip Tucker and Malcolm Reed discover the craft holds some strange secrets, and the mystery deepens when the Suliban arrive making claim to the salvage. On top of that, Captain Archer is confronted by the Tholians, who also aggressively try to procure the enigmatic vessel.

(Date is conjecture)

Archer and Trip head out on shuttlepod on a trip that takes them to the Enolian homeworld.  (prior to Canamar)

December 2152 Events of "Canamar"

Upon leaving the Enolian homeworld in a shuttlepod, Archer and Tucker are mistakenly arrested and placed on a prisoner transport vessel bound for the penal colony Canamar. Before the error can be rectified, one of the alien inmates engineers a takeover of the transport, leading Archer to engage in a dangerous gambit.

(Date is conjecture)

c. December 6, 2152 Travis Mayweather's father, the Captain of the E.C.S. Horizon, passes away.  Travis' mother tries to contact him via civilian channels to let him know the news, but the message still has not reached him six weeks later.   

(six weeks before "Horizon")

mid December 2152 Events of "The Crossing"

Enterprise is swallowed by an otherworldly vessel occupied by noncorporeal creatures who invade the bodies of crew members and trade consciousnesses with them.

(Date is conjecture)

c. December 26, 2152 The E.C.S. Horizon misses a rendezvous with an Orion freighter which upsets officials at the Cargo Authority.  Some of the crew are concerned about Paul Mayweather is performing as Captain, and morale is low.  (2 weeks before "Horizon")

Late December 2152 Enterprise encounters a small ship carrying fugitives from an abandoned colony.  (Some days before "Judgment")

2 days before Archer begins his pre-trial hearing, the Enterprise arrives at Q'onos.  ("Judgment")

early January 2153 Events of "Judgment"

Captain Archer stands accused before a Klingon tribunal of conspiring against the Empire, and his only hope of escaping a death sentence or life in the dilithium mines of Rura Penthe is an aging and disenchanted Klingon lawyer with little energy or enthusiasm for the case.

(Date is conjecture)

January 2, 2153 A change in government on Zantorus results in a militant faction coming to power that orders all off-worlders to leave the planet immediately or be placed under arrest.  (a few weeks prior to "The Breach" - exact date is speculation)

January 7, 2153 The Denoblian Science Academy looses contact with its geological team on Zantorus.  (three weeks prior to "The Breach" - exact date is speculation)

January 10, 2153 - January 12, 2153 Events of "Horizon"

When Enterprise reverses course to go investigate a planetary phenomenon, Ensign Mayweather takes the opportunity to visit the cargo ship where he was born and raised, the E.C.S. Horizon. But his father, the ship's captain, just recently died, and Travis finds that things at home haven't been the same since.

(date of January 10, 2153 was given in episode)

Note:  By this point, the Enterprise had visited 22 inhabited planets.

January 12, 2153 The Horizon resumes course to Deneva Colony.  

January 21-25, 2153 Events of "The Breach"

Enterprise is asked to evacuate a group of Denobulan geologists from a world that has been taken over by a militant faction, and since they are located deep underground, the effort requires some treacherous spelunking by the rescue team. Meanwhile Phlox faces a dilemma when another evacuee, an Antaran afflicted with a fatal dose of radiation, refuses to be treated by a Denobulan because of very old bad blood between the two races.

(date speculation)

February 2153 Events of "Cogenitor"

While studying a star in the early stages of going supernova, Enterprise encounters a race called the Vissians. The two crews get along famously, until Trip Tucker gets a little too curious about a member of the species' third gender — a nameless individual called a "cogenitor."

(date speculation)

early February 2153 The Vulcan ship Seleya enters the Delphic Expanse as is not heard from again.   Nine months later, the Enterprise encounters the vessel, damaged and with a crew that has gone insane in December 2153.   (nine months before "Impulse" - which I placed at November 2153)

February 2153    The Triannon homeworld is devastated by religious conflict.    (eight months before "Chosen Realm")

February 25 - March 1, 2153 Events of "Regeneration"

An arctic research team on Earth discovers debris from an alien vessel, nearly a century old, buried in a glacier along with the bodies of two cybernetically enhanced humanoids. Once those beings are thawed for investigation, they come to life and abduct the scientists and their transport vessel. Enterprise is called to intercept, but Captain Archer and his crew find these cyborgs to be an intractable, insidious enemy.

(Archer gave date of March 1, 2153 at the end of the episode)

c. March 10, 2153  Events of "First Flight"

While Enterprise is investigating what appears to be a dark matter nebula, Archer receives news that A.G. Robinson, his old rival in the early days of the NX test program, has died. During a shuttlepod mission into the dark matter phenomenon, Archer reminisces to T'Pol about the time he and Robinson were pilots competing for the honor of being the first to break the Warp 2 barrier.    (date speculation)

March 18, 2153 - March 21, 2153 Trip and Archer spend three days exploring an uninhabited planet.  ("Bounty")

March 21 - 24, 2153 Events of "Bounty"

A Tellarite bounty hunter captures Archer intending to turn him over to the Klingons for a substantial reward. Meanwhile, T'Pol is infected with an alien pathogen that unleashes her primal Vulcan urges.

(Date of March 21, 2153 given in episode)

early April 2153 The Vulcans send another vessel, the VonKara, out to find the Seleya.  The crew are driven insane by the Delphic Expanse and re-emerge into normal space a short time after entering.  Video of the maniacal Vulcan crew is shown to Captain Archer upon his return to Earth, after he has decided to enter the Expanse.   ("The Expanse," "Impulse")

April 7, 2153 - June 16, 2153 Events of "The Expanse"

A probe from an unknown alien source unleashes a devastating assault upon Earth. Enterprise is recalled, and along the way home Captain Archer acquires information that the perpetrators come from a region of space known as the Delphic Expanse — a place where very bizarre things happen, and from which few ships that enter ever return. Starfleet must now decide whether to risk sending the NX-01 into the Delphic Expanse to prevent a possible second attack.

(date of April 28, 2153 is given by the Captain, just prior to the Enterprise's return to Earth.   Dates given above assume it took them three weeks to return to Eatth, four weeks to refit and three weeks to get to the Delphic Expanse.)
 

late May 2153.  Kaitaama ascends the throne on Krios Prime.   ("Precious Cargo" plus 246 days)

June 2153   The Triannons' home planet is devastated in the final battle of a long religious war.  (8 months before "Chosen Realm")

June 16, 2153 The Enterprise enters the Delphic Expanse