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She doesn't have an official birthday
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They don't have official birthdays date
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His birthday is in june since in SON he refers that his 16 birthday was 2 weeks before Percy arrived, Percy arrived around the 18-19 of June giving us a one week time span for Frank's birthday, the fandom accepts June 5
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There is not an exact timeline when Randolph's family was killed (taken by Loki?) but it's implied it happened before Annabeth told Magnus she was going to run away, that would also imply that Emma and Aubrey are older than Magnus and Annabeth
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There are not official dates
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"When Magnus was six years old, his mother and uncles got into an argument at Thanksgiving"
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Annabeth runs away and finds Luke and Thalia. Grover finds Annabeth, Thalia and Luke. Thalia dies.
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Percy is kicked out of Yancy Academy, attacked by the Minotaur and brought to Camp Half-Blood for the first time.
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Percy says in TBOL that he never get to celebrate his birthday at camp because it's usually ends before his birthday.
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could also be on the 20 of December
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Zoë Nightshade dies. Percy meets Rachel Dare
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While this short story doesn't have anything to tell us when it happens around this time is the best option.
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around the middle of June
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Luke's body is taken by Kronos.
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Nico discovers Camp Jupiter for the first time
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Natalie Chase dies
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Meets Blitzen and Hearthstone
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Rachel Dare kisses Percy Jackson
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Luke Castellan dies. Rachel Elizabeth Dare becomes the Oracle. Percy and Annabeth start dating.
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This is the hardest short story to accommodate since it tells you it happens in spring and that Annabeth and Percy are already dating but since Percy is already kidnaped by the next spring (2010) and the events of the Trials of Apollo happens in 2011, summer of 2009 is the best bet.
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During the fall of this year Thanatos is captured by Gaia’s forces. Underworld starts to leak. Zeus cuts off communication to the demigods and Hera is captured
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Frank travels to California
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could also be the on June 18.
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Percy recovers his memory
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Battle in New Rome, Percy gets reunited with Tyson
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Percy and Annabeth are reunited, Percy quits his position, Jason becomes a Praetor again, Leo gets possessed and attacks New Rome with The Argo II. The Argo II crew leaves New Rome.
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The ARGO II crew arrives in Rome and gets divided, Annabeth finds the Athena Parthenos, Nico is rescued. Annabeth and Percy fall into Tartarus
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Reyna arrives on the Argo II, Percy and Annabeth leaves Tartarus, Bob and Damasen dies. Nico, Coach Hedge and Reyna leave on their quest to bring the Athena Parthenos back to Camp Half Blood. The seven sail to Athens.
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The roman attacks the greek, Nico and Reyna arrive at Camp Half Blood. Percy Jackson wakes up Gaea with a nose bleed, the seven fight next to the gods and beat the giants, Zeus sends the 7 back to Camp Half Blood. The Argo II is destroyed. Jason, Piper and Leo defeat Gaea. Leo dies.
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Percy and Annabeth first anniversary.
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Annabeth and Frederick go to Boston to look for Magnus
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and dies
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We know it happens during the spring but there is no exact date.
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The crossover stories are the most complicated to accommodate, Riordan says it happens no long after the war against Gaea but the events of the crossover can't fit with the timeline that way, it's safer to assume it happened a year after the war. The timeline of the crossover can also change in the future because of The rest of the TOA books and Magnus Chase Book 3
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The events of this crossover happens around a month later after the Son of Sobek. Annabeth mentions she had interview for a summer internship, it means it could also happen in late May or early June, also changing the timeline of the previous crossover.
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The events of this crossover happen after 4 weeks of The Staff of Serapis