I just create a complete timeline of DF-616 for Digimon Fusion Kai/Cross Generations. Like that YYGDM-01 timeline I created, I added references and future stories (but not too spoilish). Onto the history!

Disclaimer: Digimon/Dragonball Z/Kai/GT belongs to Toei Animation. Digimon Fusion Kai (not to confuse with the English title, Digimon Fusion, for Xros Wars) & YuYuGiDigiMoon belongs to Kanius. Digimon Accel Stream belongs to Chaosblazer.

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The Past</u>
DigiCycles</u>
-100,000 years ago: Huanglongmon laid out the foundations of the Four Digital Realms, which was originally a single realm. Before Huanglongmon, the Supreme Guardians and the Guardians were the watchers of pre-existing Digiworlds. This one Digital Realm became the watcher grounds for the Supreme Guardians. All of which were governed under the ENIAC and the Grand Supreme Guardian. Billsmon and Whismon are also created, that the former's role is to destroy planets as a role of balance, hence that he's called the Digi-God of Destruction. Whismon serves as Billsmon's martial arts master. Following a crisis with an ancient monster created by an evil sorcerer, all but one Supreme Guardian were killed/absorbed. Only one Supreme Guardian remains to this day.
-10,000 years ago: Somewhere in the nexus dimension, the CrimsonStardramon and its servants that parodied the Signer Dragons have fought the RedNovaDemon and digimon that parodied the Earthbound Immortals. The CrimsonStardramon's forces defeated RedNovaDemon's forces, but it come a price. The Signer Dragons became powerless and are scattered across other universes to an eternal slumber, while the CrimsonStardramon was sealed into four Crimson Digicores that are scattered across Huanglongmon's Central Realm in DF-616. Legends say that the user can grant any single wish from those digicores, and then the objects were scattered across the galaxy. If they are not return to the planet the wish was granted in 7 days, then the planet would detonate. Furthermore, the Crimson Digicores can corrupt anyone who has a black heart.
-5,000 years ago: After Huanglongmon's rise to prominence, the battle with the ancient monster forced the golden dragon to divide the single realm into four Digital Realms. All of them were designated according to the Four Paths of Chinese Mythology: North, South, East, and West. Huanglongmon created four Digimon and empowered them with authority to oversee their respective realms. You know which Sovereign watches over which realm.
-3,000 years ago: The war between the Beast and Human Digimon. Lucemon's rise and fall. Ancient Warriors sacrifice themselves and leave an essence of their powers through Spirits after destroying Lucemon.
-2,500 years ago: History of the Sephirots. The Ancients were temple priests for the Sephirot people back on the world where Skykos the Exodian Priest's power originated. Keter and Skykos battled for the supreme crown of who would rule Planet Sephirot. The battle lasted for hundreds of years, until the gem that the Ancients referred to as the Zero Unit, was forged to decide their battle. Ultimately, Keter and Skykos grabbed hold of the gem, granting them equal power. In the end, their powers became too great and destroyed Planet Sephirot. The remaining Sephirot who retreated took the Zero Unit with them, but Skykos' spirit pursued them. When they landed on Planet Void, the last of the Sephirot race evolved into descendants called the Galactic Pirates. They created Calumon as the catalyst to contain the Zero Unit, and as the key to unlocking the sealed powers of Digimon.
Taito's Ascension</u>
-2,000 years ago: Apocalymon first rips through the Wall of Fire and spill vast amounts of dark energy across the Digiverse. Various evil denizens including the Corrupts are born from this dark energy. Many dark realms are unsealed, releasing evil entities from the Dark Area and Dark Ocean. Mutalior and Burizalor are born. Burizalor is considered the cream amongst the crop of the Corrupts and receives the gift of leading the Corrupts against the Digital Knight Council.
-1,500 years ago: The war between the Corrupts and Digital Knight Council spills across the Digiverse.
-1,000 years ago: The First Ascendant, Alpha X, rises to power. He fought Pyronmon, an independent entity spawned from Apocalymon's power, and he was the first Zero user. Pyronmon was defeated, but he expelled his power in forcefully pass it to Alpha X. Overtime, the power of the Zero ability consumed Alpha X in becoming a monster and fought the Digital Knights. Alpha X eventually destroys himself along with his homeworld, Planet Primordial. Before he died, the Digital Knights retrieve his DNA to study this Ascendant power. The five Original Chosen were selected by Ebonwumon. Gennai takes up duty to train the orphans, allowing them to utilize Digivices that grant them powers to combat Burizalor's forces. The First Great War commences leading to Burizalor and his followers to be sealed behind the Wall of Fire. Shortly thereafter, Taito Yagami and his group defeat Apocalymon using their Legendary Armors to seal Apocalymon behind the wall. Second Great War occurs after Burizalor, Apocalymon, and his Corrupt forces are released by Millenniummon. Their release and collapse of the Wall of Fire causes the Eastern Realm to become warped, throwing its chronology out of sync with Earth again (thus one Earth day equals one minute in Digiworld). Burizalor establishes the Buriza Empire, an encompassing galactic federation that conquers and trades planets. The Dark Masters, Nightmare Soldiers, Demon Corps, and Nightmare Special Squad become a part of his regime. Cyrus betrays Taito and his friends, revealing to be Burizalor's spy. Taito confronts Cyrus and Burizalor. Burizalor destroys the central Digital World in the Northern Digigalaxy, destroying Taito and the last remnants of the Digital Knight Council. Gennai flees with the Digi Eggs and Digivices, later planning for the arrival of the new Digi-Destined. Manhunt ordered to find Gennai. Tags and Crests are taken by Burizalor, who promptly gives the Tags to Devimon. Cyrus/Shadramon scatters Crests across the Continent of Server. Burizalor hands Crest of Light to Myotismon. Burizalor and his cohorts seal the Holy Beasts/Sovereigns' powers, forcing them to retreat and turn into Digicores. These Digicores are sent directly toward Planet Spira, which are found by the Great Elder and guards them along with his people.
-500 years ago: Digimon Adventure (ep 1-39).
Earth Time</u>
-1940s AD: Captain American: The First Avenger. Schindler's List.
-1975-1976 AD: Taito Yagami and company are born.
-Late 1980s AD: Taichi and the Odaiba children are born.
-June 1993 AD: Jurassic Park.
-March 1995 AD: The Odaiba digidestined witness the battle of Greymon and Parrotmon.
-May 1997 AD: The Lost World: Jurassic Park.

The Present</u>
The Ascendant Era</u>
-August 3rd, 1999 AD (Digital/Real World Times Unsynchronized): Daimaomon's Conquest for Power and Digimon Fusion Kai (Ch. 1-54).
-August 6th, 1999 AD: The severely injured Burizalor is rescued by LadyMyotismon and converts himself to a cyborg.
-December 31st, 1999 AD: Iron Man 3 Flashback.
-March 25th, 2000 AD: Mutalior's Vengeance.
-Between 2000 and 2004 AD: The events of Digimon Zero Two with deviations.
-July 2001 AD: Jurassic Park III.
-2003 to 2004 AD: The Social Network.
-January 18th, 2004 AD: Digimon Fusion Kai (Ch. 55-58).
-June 20th, 2004 AD: Digimon Fusion Kai (Ch. 58).
-December 17th, 2004 AD: Digimon Fusion Kai (Ch. 58-71).
-December 18th, 2004 AD: Digimon Fusion Kai (Ch. 71).
-December 20th, 2004 AD: Digimon Fusion Kai (Ch. 71-72).
-December 21st, 2004 AD: Digimon Fusion Kai (Ch. 72-83).
-December 22nd, 2004 AD: Digimon Fusion Kai (Ch. 83-84).
-December 23rd, 2004 AD: Digimon Fusion Kai (Ch. 85-86).
-Between DFKai chapter 86-87: Yagami the Legendary Ascendant.
-December 31st, 2004 AD: The War Games (Digimon Fusion Kai Ch. 87-97)
-January 1st, 2005 AD: Digimon Fusion Kai (Ch. 97).
-January 25th, 2005 AD: Digimon Fusion Kai (Ch. 98).
-January 2005 AD: Digimon Fusion Kai (Ch. 99-102).
-February 7th, 2005 AD: Digimon Fusion Kai (Ch. 102).
The Triad Era</u>
-February 9th, 2005 AD: Digimon Fusion Kai (Ch. 103).
-February 12th, 2005 AD: Digimon Fusion Kai (Ch. 104).
-February 15th, 2005 AD: Digimon Fusion Kai (Ch. 104).
-February 23rd, 2005 AD: Digimon Fusion Kai (Ch. 105).
-February 24th, 2005 AD: Digimon Fusion Kai (Ch. 105).
-February 25th, 2005 AD: Digimon Fusion Kai (Ch. 106).
-June 2005 AD: Batman Begins.
-Between July 2005 and 2006 AD: Batman: Gotham Knight.
-November 4th, 2005 AD: Across Dimensions.
-November 26th, 2005 AD: Digimon Fusion Kai (Ch. 107).
-November 27th, 2005 AD: Digimon Fusion Kai (Ch. 108-109).
-March 26th, 2006 AD: Digimon Fusion Kai (Ch. 110-115).
-March 29th, 2006 AD: Digimon Fusion Kai (Ch. 115 where X explains about the Ascendant Legacy).
-July 2006 AD: The Dark Knight.
-August 2006 AD: Siege of GranDracmon.
-November 4, 2008 AD: Barack Obama is elected president.
-Between 2006 and 2009 AD: Lucemon's Revival. Yagami Second Coming. Digimon Accel Stream Season 2.
-April 8th, 2009 AD: Digimon Fusion Kai (Ch. 115 Epilogue).
-May 2009 AD: Digimon Fusion Kai (Season 3).
-May (After the D-Reaper conflicts) to October 2009 AD: Iron Man.
-Between 2009 and 2010 AD: Digimon Data Squad. Battle of Gods.
-2010 AD: Iron Man 2. The Incredible Hulk. Inception. Kick-Ass.
-2011 AD of YYGDM-01: The Valkyries Advent.
The Cross Era</u>
-June 2011 AD: Cross Generations (Crimson Digicores Saga - Bebimon Saga)
-Between June 2011 and December 2011 AD: Digimon Next.
-July 22nd, 2011 AD: Captain America wakes up in Time Square and meets Nick Fury after suspended animation for 70 years.
-December 15th, 2011 AD of DF-616: Curtain Call Episode in Across Convention Theme Park.
-March 2012 AD: Project X.
-May 4th, 2012 AD: Cross Generations (Super Jax Saga). The Avengers with deviations takes place.
-May 5th, 2012 AD: Cross Generations (Shadow Dramon Saga/The Dark Ending).
-September 2012 AD: The Amazing Spider Man.
-December 2012 AD of YYGDM-01: The Wrath of the Defiants.
-December 24th - 25th, 2012 AD of DF-616: Iron Man 3.

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That's all for the timeline. Updates will come as the story progresses.

Hey readers of Digimon Fusion Kai and YuYuGiDigiMoon. I just create a timeline of YYGDM that I did it for the author (to not waste time and reduce some workload) and with some help. It is pretty diverse consider its like a 'marvel universe', plus I added some minor references and future stories (but not too spoilish). Onto the history.

Disclaimer: Digimon/Sailor Moon/Yugioh/YuYu Hakusho belongs to Toei Animation. Digimon Fusion Kai & YuYuGiDigiMoon belongs to Kanius. Digimon Accel Stream belongs to Chaosblazer.

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Past</u>
DigiCycles</u>
-100,000 years ago: The Digital World's creation. Granasmon and Valmarmon are the first beings to be born. They create life of order and chaos. But both gods have different views of rulership, and so a war between light and darkness erupts. Pharaohmon betrays the forces of good, especially Anubismon. Both Granasmon and Valmarmon kill each other. Granasmon's spirit lingers, but Valmarmon's body split himself into 7 pieces while his haunting presence wanders. In the Real World, people will believe that Granasmon and Valmarmon are God and Satan respectively in religion.
Earth Time</u>
-530/418/360 mya: Walking with Monsters (Water Dwellers)
-300/280 mya: Walking with Monsters (Reptile's Beginnings)
-250/248 mya: Walking with Monsters (Clash of Titans)
-220 mya: Walking with Dinosaurs (New Blood)
-152 mya: Walking with Dinosaurs (Time of the Titans)
-149 mya: Walking with Dinosaurs (Cruel Sea)
-145 Mya: The Ballad of Big Al
-127 mya: Walking with Dinosaurs (Giant of the Skies)
-106 mya: Walking with Dinosaurs (Spirits of the Ice Forest)
-65.5 mya: Walking with Dinosaurs (Death of a Dynasty)
-49 mya: Walking with Beasts (New Dawn)
-36 mya: Walking with Beasts (Whale Killer)
-25 mya: Walking with Beasts (Land of Giants)
-3.2 mya: Walking with Beasts (Next of Kin)
-1 mya: Walking with Beasts (Sabre Tooth)
-30,000 BC: Walking with Beasts (Mammoth Journey)
-10,000 BC: The story of Sailors Pluto II and Chaos, daughters of Lord Chronos and Sailor Pluto I. It was how Pluto became her father's successor as a time guardian, while Chaos became the ultimate evil of Sailor Moon.
-8000 BC: Orichalcos corrupted the atlantians, and the Battle of Atlantis took place, resulting Atlantis sunk to the deep seas. The Legendary Dragons and Great Leviathan were sealed. The Legendary Signer, the Crimson Dragon and Signer Dragons battled the Crimson Devil, Red Nova. This resulted in Red Nova being sealed in the Earth, creating the serpent Nazca Line.
-3067 BC: The Scorpion King. After the events of the movie, the title character then leads his forces to try conquered the world (The Mummy Returns).
-3060 BC: The Scorpion King's army was defeated, but Mathayas gave his soul to Anubis to give an army of jackals. The jackal warriors destroy everything in Egypt till they were vanished (The Mummy Returns).
-3000 BC: The Earthbound Immortals disturbed the Inca civilization, the People of the Stars. The Star Dragon King prayed to the Dragon Star for salvation. The Crimson Dragon and Signer Dragons were sent in response. The Crimson Dragon and Signer Dragons battled the Earthbound Immortals, resulting in the Earthbound Immortals and Ancient Fairy Dragon being sealed in the Earth, forming more Nazca Lines.
-1290 BC: High Priest Imhotep engaged in an affair with Anck-su-Namun. Results are not pretty. (The Mummy, The Mummy Returns)
-1000 BC: The events of Atem the Pharaoh, such as him defeating Zorc.
-992 BC: The fall of the Silver Millennium. The Dark Kingdom, led by Queen Beryl and the power of Queen Metallia, invades the Moon Kingdom and the planet Earth. The invasive dark forces destroy much of the royal guard, including Princess Serenity, Prince Endymion, and the Sailor Senshi. Queen Serenity uses Silver Crystal to seal away the invaders for thousands of years and with her last ounce of strength sends her daughter, Endymion, and the Senshi to become reborn as normal humans. Luna and Artemis are also sent with them. Queen Serenity passes away and shatters the Silver Crystal into the seven Rainbow Crystals, each with a Great Youma, who are also reborn as humans as well.
-Feudal Japan (1185 – 1868): The events of Inuyasha
-1400s AD: The spirit of Valmarmon turns Dracula into a vampire and gave him wings.
-1888 AD: Van Helsing
-1926 AD: The Mummy
-1933 AD: The Mummy Returns
-1946 AD: The Mummy Tomb of the Dragon Emperor
-1950s to 1980s: Forrest Gump
-1980 AD: The Shining. It is revealed that the Overlook Hotel was created by Valmarmon's spirit for luring people to create frightening chaos.
-Between 1980 and 1999 AD: Evil slowly begins to emerge and spread across the world. It takes a while for the first modern day heroes to respond to the darkness'.
-1984 AD: Doctor Rob "Dolphin" McCoy begins to experiment in creating artificial life, using drawings made by his son as a basis for the creatures he designs. He is soon joined in his work by students Janyu "Tao" Wong, Goro "Shibumi" Mizuno, Rai "Curly" Aishuwarya, "Babel," and "Daisy" (real names not known). Together, they form the group called the Monster Makers - and create the beings known as Digimon.
-1997 AD: The events of Codename: Sailor V. Minako Aino becomes Sailor V and emerges as Japan's first modern day hero, setting up the rise of heroes' response to the evil forces.' Digimon becomes a children's virtual pet-type computer game, and immediately becomes a big hit.
-1998 AD: Digimon becomes a card game.
-Between 1998 and 1999 AD: Sailor Moon: Classic – Super S Story Arcs. The Sailor Senshi are the first group of modern heroes. More heroes will later emerge to follow their example and become allies with them.'
-1999 AD: Digimon Adventure (Also an actual TV series)
-2000 AD: Sailor Moon: Sailor Stars Arc
-Between 2000 AD and 2001 AD: The Japanese government sets up it's own SIGINT organisation to monitor the network, known as "Hypnos." The organisation soon becomes aware of the Digimon, existing autonomously within the network, and labels them "Wild Ones," setting up protocols to deal with them as they "Bio-Emerge" into the real world.
-2001 AD: Digimon Tamers. Special Gaiden: Underworld Saga.
-2002 AD: Digimon Zero 02 (Also a TV series). Digimon Frontier. YuYu Hakusho: Spirit Detective Saga. Yugioh: Duelist Kingdom/Battle City.

Present</u>
-March 2003 AD: The Wrath of Pharaohmon/Redux
-Between March and November 2003 AD: YuYu Hakusho: The Dark Tournament Saga. Yugioh: Waking the Dragons/The Grand Prix/Dawn of the Duel.
-November 2003 AD: The Invasion of the Rajita
-Between November and January 2003 AD: Yugioh: Ceremonial Battle
-January 2004 AD: YuYu Hakusho: Chapter Black Saga
-Between 2004 and 2005 AD: YuYu Hakusho: The Three Kings Saga
-July 2005 AD: YuYu Hakusho: The Makai Tournament
-August 2006 AD: Search of the Kuiper Senshi. Digimon Data Squad.
-October 2006 AD: The Taiyoukai Awakening
-2007 AD: Yugioh GX – Year 1
-March 2008 AD of YYGDM-01: Across Dimensions
-Summer 2008 AD: Summer Diaries/Special Edition. Yugioh GX – Year 2.
-March 2009 AD: Dawn of Chaos. Yugioh GX – Year 3.
-August 2009 AD: Siege of GranDracmon
-March 2010 AD: The Yugioh GX cast (Jaden, Syrus, Alexis, Chazz) graduated.
-May 2009 AD of DF-616: Digimon Fusion Kai – Season 3
-April 2010 AD: Neos United/The West Coasters
-2011 AD: Valkyrie Advent
-June 2011 AD of DF-616: Cross Generations (Black Digicores Saga/Bebimon Saga)
-December 2011 AD of DF-616: Cross Generations (Curtain Call Episode)
-May 4th, 2012 AD of DF-616: Cross Generations (Super Jax Saga). The Avengers with deviations.
-May 5th, 2012 AD of DF-616: Cross Generations (Shadow Dramon Saga/The Dark Ending)
-December 2012 AD: The Wrath of the Defiants

Future</u>
30th Century: The events of The Rise of Crystal Tokyo. Yugioh 5Ds. The Crystal Age. The Future is Wild of deviations.

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That's all for the timeline. A few updates will come if there's any changes.