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Happy Death Day (2017) movie poster

Timeline

Happy Death Day (2017) Timeline Explained – Every Event in Order

Release, runtime and language
2017 · 96 min · English
Echo score 75
JustWatch #182 21
Directed by
Christopher B. Landon
Starring
Israel Broussard, Brady Lewis, Charles Aitken, Donna DuPlantier, GiGi Erneta, Jason Bayle
Budget
$4.8M

On her birthday, college student Tree Gelbman discovers she is trapped in a repeating time loop, forced to relive the same day over and over again. Each iteration finds her stalked by a masked killer. As the day repeats, Tree’s fear transforms into a resolve to uncover the identity of her pursuer and solve the mystery of her own murder, desperately seeking a way to break free from this terrifying cycle.

Mystery Thriller Horror Cast, crew & box office
On this page (6)
  1. 1 Where to watch
  2. 2 Events in order (15)
  3. 3 Timeline questions answered
  4. 4 Movie threads
  5. 5 Movies like Happy Death Day
  6. 6 Every angle

Where to watch

Where to Watch Happy Death Day (2017)

Where can you watch Happy Death Day? Stream, rent or buy it in the US, including on HBO Max, Peacock Premium and Peacock Premium Plus: current JustWatch availability with up-to-date prices.

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15 events in order · contains spoilers

Happy Death Day Timeline: Events in Chronological Order

Every key event of Happy Death Day (2017) in order, scene by scene, with when and where it takes place. Use it to untangle flashbacks, time jumps and parallel storylines, to refresh your memory before the sequel or to find the exact scene you are thinking of.

  1. Tree's Groggy Birthday

    The film opens on Monday, the 18th, as Teresa 'Tree' Gelbman celebrates her birthday. She awakes in the dorm room of her classmate Carter Davis, feeling disoriented and groggy.

    When
    Monday, the 18th
    Where
    Bayfield University

  2. Awkward Morning Encounters

    As Tree stumbles through her morning, she has an uncomfortable encounter with Carter's roommate Ryan. He jokes about their night together, leaving Tree feeling disgusted and embarrassed.

    When
    Morning
    Where
    Bayfield University

  3. Unpleasant Memories

    On her way back to her room, Tree faces Tim, a guy she had previously dated. His accusation about being ignored reminds her of their disappointing Subway outing, prompting her to dismiss him.

    When
    Mid-Morning
    Where
    Bayfield University

  4. Cupcake Disdain

    Upon returning to her room, Tree’s roommate Lori surprises her with a homemade cupcake. Tree shows her disdain by blowing out the candle and tossing the treat into the trash due to her carb concerns.

    When
    Mid-Morning
    Where
    Dorm Room

  5. Secret Affair

    Later, Tree attends class and engages in a secret affair with her married professor, Gregory Butler. Tension mounts as their relationship threatens to lead to complicated consequences.

    When
    Afternoon
    Where
    Classroom

  6. Sorority Lunch Conflict

    During a lunch meeting with her sorority sisters, Tree witnesses Danielle reprimanding a sister for bringing junk food. This showcases the social dynamics and pressures within the sorority.

    When
    Afternoon
    Where
    Sorority House

  7. Murder at the Dorm

    As the day progresses, Tree encounters a mysterious figure wearing a baby mask. In a shocking turn of events, she is stabbed to death by the masked killer, ending her birthday in horror.

    When
    Evening
    Where
    Dormitory

  8. Caught in a Loop

    Tree wakes up again in Carter's room, realizing she is trapped in a time loop. Each time she attempts to change her fate, she finds herself meeting the same gruesome end.

    When
    Repeating Days
    Where
    Carter's Room

  9. Desperate to Find the Killer

    With each iteration of the day, Tree becomes increasingly frantic to identify the killer behind her murders. She starts narrowing down her list of suspects, including Tim, Danielle, and Gregory.

    When
    Repeating Days
    Where
    Various Locations

  10. Uncovering the True Villain

    After witnessing the murder of her professor, Tree believes serial killer Joseph Tombs is the mastermind behind the chaos. She prepares for a confrontation with him, seeking closure.

    When
    Repeating Days
    Where
    Various Locations

  11. Showdown with Tombs

    In a tense climax, Tree confronts Joseph Tombs after multiple narrow escapes. Despite the high stakes, she manages to overpower him, momentarily breaking the deadly cycle.

    When
    Evening of the Loop
    Where
    Various Locations

  12. The Poisoned Cupcake

    In a final twist, Tree learns she was poisoned by a cupcake from Lori, which led to her original death. Lori's jealousy becomes the catalyst for her deadly schemes, revealing the true antagonist.

    When
    After Defeating Tombs
    Where
    Dorm Room

  13. Confrontation with Lori

    A climactic battle ensues between Tree and her roommate Lori. Tree fights back against Lori’s betrayal, ultimately overcoming her in a fierce struggle for survival.

    When
    After Poison Revelation
    Where
    Dorm Room

  14. Finding Solace

    The film concludes with Tree and Carter at a diner, reflecting on their wild experiences. They share a moment of laughter and intimacy, symbolizing a fresh start after chaos.

    When
    Next Day
    Where
    Diner

  15. A New Day Begins

    Carter playfully hints at the end of the loop when he reveals it’s Tuesday, the 19th. Their shared moments after the trials suggest hope and resilience as Tree smiles onto a new chapter.

    When
    Tuesday, the 19th
    Where
    Diner

Last updated: November 08, 2024 at 07:04

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Timeline questions answered

Happy Death Day Timeline Explained: Your Questions Answered

When does it happen, and why in that order? The questions people ask about the chronology of Happy Death Day (2017): time jumps, flashbacks, cause and effect between scenes and the correct order of events, each answered with spoilers.

Q1

Why is Tree stuck in a time loop in Happy Death Day?

Tree becomes trapped in a time loop after she is murdered by a masked killer on her birthday. Each time she dies, she wakes up back in Carter's room on the same morning of Monday, October 18th. The loop continues until she can break it by defeating her true killer.

  • time loop
  • murder cycle
  • monday 18th
Q2

Who is the masked killer trying to kill Tree?

The masked killer is Tree's roommate Lori Spengler, who wears a baby mask to conceal her identity. Lori poisons Tree with a cupcake on her birthday, which initially appears to be the cause of her death, but in the time loop narrative, Tree is repeatedly stabbed by Lori wearing the mask.

  • masked killer
  • baby mask
  • lori killer
Q3

Why does Lori want to kill Tree?

Lori is obsessed with Tree and becomes jealous of her lifestyle and relationships. The film reveals that Lori's affection for Tree was romantic in nature, and she grew resentful when Tree dismissed her cupcake and ignored her feelings, leading Lori to poison her out of revenge.

  • lori motive
  • jealousy
  • poison cupcake
Q4

Why does Tree think Joseph Tombs is the killer?

Tree believes Joseph Tombs is the killer because he is a known serial killer who escaped from custody around the time of her murders. After witnessing her professor Gregory Butler get murdered, Tree concludes the serial killer is targeting her, though this turns out to be a red herring.

  • joseph tombs
  • serial killer
  • wrong suspect
Q5

Who does Tree suspect of being the killer throughout the movie?

Tree goes through several suspects during the time loop. She initially suspects Tim, the guy she had an unpleasant date with. She then considers Danielle from her sorority, and later her married professor Gregory Butler. After seeing the professor killed, she believes serial killer Joseph Tombs is responsible before discovering the truth about Lori.

  • suspects
  • tim
  • danielle
  • gregory butler
Q6

What is the poisoned cupcake twist in Happy Death Day?

The film reveals that Lori poisoned the homemade cupcake she gave Tree on her birthday. This explains why Tree died in the original timeline before entering the time loop. The poison was Lori's primary method of murder, though the masked killer stabbing appears during each loop iteration.

  • poison
  • cupcake
  • lori poison
Q7

How does Tree finally break the time loop?

Tree breaks the loop by defeating Lori in a direct confrontation after discovering the truth about the poisoned cupcake. By overpowering and defeating her true killer, Tree escapes the cycle and wakes up on Tuesday, October 19th, the day after her birthday.

  • break loop
  • defeat lori
  • tuesday 19th
Q8

Why does Tree wake up in Carter's room every time?

Tree wakes up in Carter's dorm room because that is where she originally started her birthday morning before being killed. The time loop resets her to the exact starting point of that day, which happens to be Carter's room where she spent the night.

  • carter davis
  • dorm room
  • morning reset
Q9

What happens to Tree's professor Gregory Butler?

Gregory Butler, Tree's married professor with whom she is having an affair, is murdered by the masked killer (Lori) in one of the time loop iterations. This event happens while Tree is hiding and watching, leading her to wrongly conclude that the serial killer Joseph Tombs is behind all the murders.

  • gregory butler
  • professor killed
  • affair
Q10

How does Tree change throughout the time loop?

Tree transforms from a self-absorbed, dismissive college student into a determined survivor who fights back against her killer. Each death makes her more desperate and resourceful, ultimately leading her to take control of her fate rather than simply trying to avoid death.

  • character growth
  • transformation
  • empowerment
Q11

What is the Groundhog Day reference at the end of Happy Death Day?

At the diner, Carter compares Tree's experience to the movie Groundhog Day, where Bill Murray's character is also trapped in a time loop. Tree humorously admits she has never seen Groundhog Day, and Carter reveals it's Tuesday, confirming the loop has finally ended.

  • groundhog day reference
  • tuesday
  • movie reference
Q12

Is Lori the main villain in Happy Death Day?

Yes, Lori is the true main villain of Happy Death Day. The film uses Joseph Tombs as a misdirection, making viewers believe he's the antagonist. The real twist is that Tree's friendly roommate Lori orchestrated the entire murder scheme out of obsessive jealousy.

  • main villain
  • plot twist
  • lori reveal

Movie threads

More Movies Like Happy Death Day, by Mood & Story

Curated lists built around what makes Happy Death Day tick: the same mood, the same kind of story or the same emotional payoff. Each list explains why these movies belong together.

Deadly Time Loop Movies like Happy Death Day

Characters trapped in a repeating day, forced to solve a mystery to survive. If you enjoyed the high-stakes puzzle of Happy Death Day, you'll love these movies where characters are trapped in a time loop, racing against death. Discover similar thrillers and horror films that use the repeating day trope to build suspense and drive a mystery-solving narrative.

  • suspenseful
  • anxious
  • determined
  • paranoid
  • energetic
  • cathartic
  • Tone: tense, suspenseful
  • Pacing: fast, relentless
Why these movies?

The story pattern: The narrative follows a cyclical structure where the protagonist dies repeatedly, learning from each failure. The core conflict shifts from pure survival to investigative deduction, creating a arc of personal growth from victim to empowered agent. The plot is driven by the central mystery of who or what is causing the loop.

Why they belong together: Movies in this thread share the specific 'Groundhog Day' mechanic applied to a life-or-death thriller context. They blend high tension with a procedural, puzzle-like structure, creating a unique mix of horror, mystery, and character transformation that feels coherent and compelling.

Happy Death Day movie poster

Happy Death Day

2017
Timecrimes movie poster

Timecrimes

2008
Time Cut movie poster

Time Cut

2024
Until Dawn movie poster

Until Dawn

2025
Time Lapse movie poster

Time Lapse

2015
Ticking Clock movie poster

Ticking Clock

2011
Boss Level movie poster

Boss Level

2021
Happy Death Day 2U movie poster

Happy Death Day 2U

2019

Transformative Slasher Horror Films like Happy Death Day

A horror story where the final girl's journey is one of profound personal change. Fans of Happy Death Day's blend of slasher scares and character growth will enjoy these movies. Find similar horror stories where the final girl's fight for survival leads to significant personal transformation, often with a mix of tension, dark humor, and a ultimately hopeful outcome.

  • suspenseful
  • cathartic
  • empowering
  • dark humor
  • energetic
  • coming of age
  • Tone: tense, darkly comedic, empowering
  • Pacing: fast, energetic
Why these movies?

The story pattern: The narrative begins with a typically flawed or superficial protagonist who is targeted by a killer. The repeated threats and narrow escapes force them to shed their old self, developing resilience, intelligence, and courage. The story is as much about the internal metamorphosis as it is about defeating the external monster.

Why they belong together: These films are grouped by their shared focus on a 'final girl' archetype who undergoes a substantial positive character arc amidst the horror. They balance high-intensity scares with themes of self-discovery and empowerment, creating a uniquely satisfying and energetic vibe within the slasher genre.

Slumber Party Massacre movie poster

Slumber Party Massacre

2021
Freaky movie poster

Freaky

2020
Happy Death Day movie poster

Happy Death Day

2017
Clown in a Cornfield movie poster

Clown in a Cornfield

2025
Slay movie poster

Slay

2024
It's a Wonderful Knife movie poster

It's a Wonderful Knife

2023
Death Proof movie poster

Death Proof

2007
Shrunken Heads movie poster

Shrunken Heads

1994

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Every angle

Happy Death Day (2017) Explained: Plot, Ending, Timeline & Characters

Everything about Happy Death Day in one place: what happens in the plot summary, the timeline in chronological order, the characters and meaning, the ending explained and a spoiler-free summary. What's After the Movie adds the cast, box office and post-credit scenes.

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