Timeline of the Sixth Alternate TImeline.

Exile Era: the 1000 years of Nightmare Moon's banishment, ended upon Nightmare Moon's death.

November 2nd, 985: Day where Rainbow Dash's rainboom failed due to Starlight Glimmer's interference. Twilight Sparkle failed her test and the five fated friends fail to get their destined cutie marks causing the alternate timelines to spawn. A member of the ESSA submits the sighting but nothing is thought of it.

July 2nd, 986: Princess Celestia sees Twilight's raw power after an accident with battle0magic and decides to take Twilight as her personal student. Twilight gains a cutie mark in magic, a different kind of magic.

December 20th, 986: Rainbow Dash gets a cutie mark in friendly competition and now accepts that winning isn't everything but still tries in competitions for the thrill of it.

December 25th, 986: Fluttershy helps out an old mare and saves her life, earning the medic cutie mark.

January 1st, 987: Applejack Returns to the farm after deciding that the sophisticated life is not for her. She earns her cutie mark in being true to herself as an Apple.

December 3rd, 987: Pinkamana Diane Pie proves her worth as an excellent baker and earns a baked pie as her cutie mark.

August 13th, 990: Rarity earns a cutie mark in modelling after being recognized as potential by Photo Finish.

November 30th, 999: The stars are ready to free Nightmare Moon.

December 21st, 999/0: Nightmare Moon is freed but there are no Elements of Harmony forcing Celestia, Cadence and Twilight to engage Nightmare Moon. Despite several pleas for Nightmare Moon to reform, Nightmare Moon was killed much to the dismay of Princess Celestia.

Harmony Era: The Era of the years after Nightmare Moon's death.

February 7th, 0: Twilight attends a Grand Galloping Gala, only for it to turn into a disaster, with a little help from Princess Celestia.

March 1st, 0: Discord is freed by the Cutie Mark Crusaders, Discord was defeated and was hit with a magic where he cannot return to Equestria ever again.

April 25th, 0: The Canterlot Wedding, plays out exactly as the Prime Timeline intended to, Shining Armor and Cadence defeat Chrysalis and her changelings.

May 12th, 0: King Sombra and the Crystal Empire returns. Twilight throws the heart to Princess Cadence and Sombra is wiped out by the heart.

September 1st, 1: Sunset Shimmer calls for help from the Sirens who have come to Canterlot High to feed. Sunset realizes to errors of her ways and opts to go down a better path thanks to Twilight. The Fated Friends are still broken up.

September 31st, 1: Tirek appears and is once again, sent back to Tartarus thanks to a cunning plan thought up by Twilight Sparkle.

October 21st, 2: Princess Celestia decides to inspect the ESSA archives the next day and offers to take Twilight Sparkle with her, Twilight accepts.

October 22nd, 2: Chapter 1.