In most Time Travel stories, there's always that one day that causes a Butterfly of Doom on the space-time continuum. But here, it's this specific day that results in your life changing on a drastic scale.
Say if someone travels back to the date of your birth and interferes with the birthing process, this could result in your life being different to how it was in the present.
Examples:
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Comic Books
- In Flashpoint, The Flash finds himself in an altered timeline where Thomas Wayne is Batman, Superman is nowhere to be found, and Wonder Woman is now at war with Aquaman. It turns out that all these changes occurred when Barry traveled back to the date of his mother's murder at the hands of Thawne.
Film — Live-Action
- In Back to the Future Part II, Old Biff from 2015 decides to give his younger self from 1955 a sports almanac in order to make himself a millionaire in the future. The date he chooses? November 12, 1955. That's right! The same day from the first movie! Lampshaded by Doc Brown as the chronological junction point for the entire space time continuum.
Live-Action TV
- In the Henry Danger episode "Back to the Danger", Drex uses the Time Jerker's time machine to travel back to 1989 to "Take Your Kid to Work Day", which as it turns out is the day Ray became industructible.
Western Animation
- In The Fairly OddParents! episode "The Secret Life of Denzel Crocker", March 15th is The Dreaded to the students of Dimmsdale Elementary, due to it being the day Denzel Crocker is at his worst. It turns out that on March 15th, 1972, Crocker lost his fairies, Cosmo and Wanda and became the crazy teacher that he is in the present.
- In the Phineas and Ferb episode "Phineas and Ferb's Quantum Boogaloo", when Candace the future decides to use the time machine to bust Phineas and Ferb once and for all, she time travels back to where it all began: The first day of summer.
