The 25th Century and beyond

2400      In the "Endgame" timeline, Captain Harry Kim heads out on a four year exploration mission; Sabrina, Naomi Wildman's daughter, is born; and Ensign Miral Paris begins working on acquiring a temporal device from the Klingons.  (22 years after "Endgame, Part 2"  -VGR)

2403  The time from which Admiral Janeway left to go back and change history with the aim of returning Voyager to Earth earlier. This timeline was undone by events changed in 2377.  

It remains to be seen if the Janeway of the current timeline will go back in time to fulfill this role. Stardate circa 80500.

Other events of this timeline:  Captain Harry Kim returns from his four year exploration mission. Voyager's EMH names himself Joe, in honor of his new wife's grandfather. 

(26 years after "Endgame, Part 2"  -VGR)

2405   Norvo Tigan's sentence is finally complete, and he is released from prison on New Sydney.  (30 years after "Prodigal Daughter")

2408 In "The Visitor" timeline, Benjamin Sisko appears from subspace for the last time until 2422.

2410  Time from which the future Alexander Rozhenko came, when he assumed the identity of K'mtar and visited himself in 2370. Stardate circa 87500.   In this timeline, Alexander became a peacemaker, and tragically caused Worf's death in the Klingon High Council ("First Born" (TNG))

2422 In "The Visitor" timeline, aboard the Defiant, Jake Sisko attempts to get his father back from subspace.

2450  Jake Sisko dies while being visited by his father, Benjamin Sisko, from subspace.  This event releases the subspace tie between them and transfers Ben back to the year 2372, and this alternate timeline ceases to exist.  ("The Visitor" - DS9)

mid 25th Century  The time traveling people of the galaxy agree to the Temporal Accords, a series of regulations governing time travel.  They appear to have similar guidelines to those adopted by Starfleet as the "Temporal Prime Directive,"  (speculation - the Temporal Accords exist by the mid 28th Century, and were likely in place in the era of Rasmussen's time machine, which was the 2500s.)

2500s  Sometime in the 26th century, a researcher travels back to New Jersey, Earth, in the 22nd century, where his time pod is stolen by Berlinghoff Rasmussen. ("A Matter of Time" (TNG))

2554    The Battle of Krotion Five, where the United Federation of Planets makes a stand against the trans-dimensional Sphere Builders who are attempting to convert a huge area of the Milky Way into an area that they can inhabit.   One of the ships participating in the battle is the U.S.S. Enterprise-J.  The Enterprise J has Xindi serving on it, as the Xindi have joined the Federation by this point in time.   It is a huge battle, and a turning point in history.  The Federation wins, and the threat is eliminated, but had the Federation not succeeded, the entirety of the Federation would have been wiped out by the advancing Sphere-configured space.  

Looking through history, the Sphere Builders were able to see this Battle, and its outcome, and determined to work with the Xindi to try and prevent the Battle of Krotion Five from ever taking place.  To this end, they convince the Xindi to attempt to wipe out the Earth in 2154, and thus prevent the formation of the Federation.    

Daniels brings Archer to this time and place, from early 2154, to convince the Captain of the need to make peace with the Xindi and preserve the future.   (400 years after "Azati Prime") 

2573   The new Xindi homeworld, in the Delphic Expanse, is destroyed.  ("The Expanse")  According to Daniels, the Xindi homeworld is in fact destroyed by the trans-dimensional Sphere Builders in an alternate future.    However, the Sphere Builders convince the Xindi that the people of Earth are responsible for the destruction of their homeworld, and not the Sphere Builders themselves.   Fearing for the survival of their people, this triggers an attack on the Earth by the Xindi in 2153, resulting in the death of 7,000,000 humans.   (The destruction of the Xindi homeworld is noted to be 420 years after "The Expanse")      

2600s  Sometime in the 27th century, scientist Kal Dano invents the Tox Uthat, a quantum phase inhibitor with enormous weapons potential. Boratus and Ajur, two Vorgons (pictured) attempt to steal the Tox Uthat, but are thwarted.   To keep the Uthat from falling into their hands, Dano travels back in time to the 22nd century to hide the device on Risa. ("Captain's Holiday" (TNG))

2700s  An alien force from this time enlists the aid of the 22nd century Suliban in order to wage the Temporal Cold War.   

These people are not able to manifest themselves physically in the past, but could only partially materialize to deliver information.  One of their number appears as a shadowy figure to Silik, who is the primary liaison with the 22nd century Suliban.    (300 years prior to 31st century "Shockwave - Part II")

This mysterious Time Traveller also appears to Captain Archer in April 2153 after the Xindi attack on Earth.  ("The Expanse")

2769  A research group from this time period travels back to view the construction of the Great Pyramid at Giza, at least according to "Daniels."  He indicates that there are properly following the procedures laid out in the Temporal Accord.   "Cold Front" (ENT).

2800s  In the 29th century, Captain Braxton becomes Captain of the Federation timeship Aeon. 

A massive explosion destroys Earth's solar system, for which the crew of Voyager is blamed. 

Capt. Braxton travels back in time to destroy Voyager in 2373, but he fails and crashes on Earth in 1967. 

It turns out that actually Henry Starling would be responsible for the disaster. The Voyager crew manages to stop Starling in the year 1996, so the temporal explosion does not take place, and the timeline is restored.  "Future's End" (VGR)

At this point in history, Starfleet is the body that appears to enforce the rules of the Temporal Accord on behalf of the Federation.   This has apparently changed by the 31st century.    "Cold Front" (ENT).

In a different timeline, Braxton commanded the 29th century timeship Relativity in an effort to prevent a saboteur from destroying Voyager with a weapon designed to fracture space-time. 

Prior to the weapon's detonation in 2375, Braxton recruited Seven of Nine to jump through time to locate where and when the weapon was placed, because her ocular implant was able to detect disruptions in space-time. 

Eventually it was learned that Braxton himself was the saboteur. 

An older version of Braxton suffered from temporal psychosis and blamed Voyager for his circumstances — 30 years of exile on 20th-century Earth, the temporal inversion in the Takara Sector, repeated rehabilitation, loss of rank, and forced retirement. 

The older Braxton was apprehended, and the younger one on the Relativity was arrested by his first officer, Lt. Ducane, for crimes he was "going" to commit. The different versions of Braxton were re-integrated to stand trial, but he was guaranteed leniency in exchange for revealing the precise moment he boarded Voyager to plant the weapon.    ("Relativity" (VGR)
 

3000s  - the 31st century The Kyrains blame the ruthless "warship Voyager" for causing a war with the Vaskans 700 years ago. 

When the backup module of Voyager's EMH is reactivated in a museum on the Kyrian homeworld, the Doctor disputes this incorrect view of history that has been established throughout the centuries (VOY: "Living Witness").

Six years later in the 31st century Quarren, the director of the Kyrian museum, passes away, but not before he can witness the dawn of harmony on his planet ("Living Witness" - VOY).

Many years later (in the 31st century) the EMH, having become a renowned person on the Kyrian homeworld, finally takes a shuttle and heads for the Alpha Quadrant ("Living Witness" - VOY).

Also, in the 31st Century, the man who would become known as "Daniels" grows up in Illinois, on Earth.  He is a citizen in what has practically become a utopian society.  ("Cold Front," "Shockwave - Part II")   

In high school, Daniels learns the basics of quantum mechanics and time travel.  ("Shockwave - Part II")

He later becomes a part of an organization dedicated to enforcing the laws of the Temporal Accord, an agreement reached by all time faring worlds to allow for time travel only for research, and to ensure the preservation of history.   Daniels considers joining Starfleet, but ultimately does not.    ("Cold Front") 

Daniels Goes to Meet Archer  (Cold Front)

At some point, he is assigned on a mission to go to 2151 to assist the crew of the Enterprise NX-01, and to defend them from the Suliban who are being manipulated by beings from the 28th century.    ("Cold Front," "Shockwave - Part II")

Alternate Timeline  (Shockwave)

In attempting to prevent Archer from being held captive by the Suliban in 2152, Daniels is ordered by his superiors to brings Archer to the 31st century to protect him.    ("Shockwave")

Unfortunately, the action is a miscalculation, and results in the Earth being devastated at some point after 2152.   When Archer arrives in the 31st century, he is greeted by a startled Daniels and finds himself in a large city that was long ago destroyed by a great cataclysm.  ("Shockwave")    

In this alternate future, the United Federation of Planets was never formed.   Technological development may have been slower in this timeline, as history is kept in books written on paper, as opposed to electronically.

The Earth does make contact with the Romulan Star Empire, but this encounter is between Earth and Romulus, and does not parallel development of the Federation.  

This alternate history deviates from the normal timeline at the point of the Warp 5 program, suggesting that Archer's dislocation had effects both before and after his point of removal, which was February 2152.  

This timeline is presumably erased when Starfleet agrees to continue Archer's mission at the end of "Shockwave - Part II."

Lost Ship Timeline  (Future Tense)

A small timeship, commissioned in the 31st century, sets out on what is possibly an historical research mission.  Something goes horribly wrong and the ship is scorched internally and externally, instantly killing the human pilot.  The ship emerges 100 light years from Earth in December 2252.

The vessel is powered by a temporal drive, a prize of great value to the pre-time travel civilizations of the 22nd century Alpha Quadrant.  The pilot himself is an anachronism as his genetic makeup includes DNA from Vulcans, Rigellians, Tarellians and many other species - his ancestors who were not all human. 

In 2252, an electronic beacon from the ship is reconstructed and activated by Trip Tucker, and time travelers from the 31st century are presumably able to retrieve the vessel, the beacon, and the body of the pilot from the 22nd century.   ("Future Tense")