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This page contains important dates or occurrences during the events of Percy Jackson and the Olympians and The Heroes of Olympus series. Rick Riordan has stated that there is no specific year or timeline that the series takes place as book time is not tied to real time. [1]


    • Nico di Angelo's birthday year could be around 1932 because he states in The House of Hades that he had visited Diocletian's Private Residence with his mother and sister when he was about six around the year 1938.






  • June 13, 2005 - Percy confronts Echidna and the Chimera at the St. Louis Arch.
  • June 13, 2008 - At Geryon's ranch, Percy Jackson and Grover Underwood discuss the fact that seven days have passed since they first entered the Labyrinth. Then Percy gives Grover a pep talk on the quest for Pan.
  • June 14, 2005-The quest for Master Bolt continues.
  • June 20, 2005 - Percy, Annabeth, and Grover enter the Underworld and meet Hades.
  • June 21 - The summer solstice, when all the gods gather to have a meeting.
  • June 23, 2010 - Frank, Hazel, and Percy arrive at Grandma Zhang's house in Canada.
    • They fight off Laistrygonian Giants surrounding the house.
    • They escape the house and fly to Alaska.
    • Percy, Hazel, and Frank arrive in Alaska.
    • Frank uses his last spartus against a group of Gryphons.
    • Percy develops a fear of drowning after falling into Muskeg.
  • Late June 2008 - A Capture the Flag game turns into a search for the Bronze Dragon.


July 5, 2010 - The quest of the Seven continues.

  • July 7th, 1994- Leonidas "Leo" Valdez is born to Esperanza Valdez and Hephaestus.
  • July 7th, year unknown— Artemis and Apollo were born to Leto and Zeus in the island of Delos.


  • August 1, 2010 - Feast of Spes, Roman goddess of hope
    • During the second Gigantomachy, this is the intended day of Gaea's awakening.
    • Gaea awakens due to the blood of Annabeth Chase and Percy Jackson.


  • September 2007 - Percy helps Clarisse beat Phobos and Deimos to retrieve the stolen chariot.
  • September 15, 2009 - Venti continue to cause havoc after being released when Typhon was defeated.
    • Aeolus orders all demigods to be killed as a result.
  • September 18, 2009 - Percy and Annabeth's one-month anniversary.
    • The fire-breathing giant Cacus steals Hermes' caduceus.
    • Hermes seeks Percy's help to get his caduceus back.
    • In a battle against Cacus, Percy and Annabeth learn that Cacus plans to cut off communication among the Olympians, as part of Gaea's plan to overthrow the gods.
    • After destroying Cacus, Percy and Annabeth are sent to Paris for their date, as part of Percy's deal with Hermes.
    • Around this time, Zeus has been threatening to close off Mount Olympus to mortals.



  • November 2009 - Zeus recalls all the gods back and closes Olympus, forbidding all contact with demigods and mortals.


  • December 15, 2007 - Artemis sets out on a hunt, leaving Zoë in charge of the Hunters. Her twin brother, Apollo, arrives to escort Percy, Thalia, Grover, Nico, Bianca and the Hunters to Camp Half-Blood.
  • December 17, 1928 - Hazel Levesque is born to Marie Levesque and Pluto.
  • December 17, 1941 - Hazel turns 13.
    • Pluto visits Hazel and her mother, Marie, in New Orleans.
    • Hazel and Marie move to Seward, Alaska.
  • December 18, 2009 - Jason, Leo, and Piper begin their quest to save Hera.
  • December 21, 2007 - Zoë Nightshade dies from the poison of Ladon and the blow from her father Atlas while fighting him on Mount Orthys, the Titan base.
    • A new constellation is formed by Artemis from the body of Zoë Nightshade, known as "the Huntress."
    • Thalia becomes the new lieutenant of the Hunters of Artemis, declaring Percy Jackson as the child of the Great Prophecy.
    • Nico di Angelo runs away from camp.
  • December 25, 2008 - Percy Jackson, Thalia Grace, and Nico di Angelo are sent by Persephone to retrieve Hades' sword from Ethan Nakamura.
  • December 25, 2009 - Carter and Sadie decide to go to the forbidden library to search for things about their dad's suspicious death and the Demon Days. Set send monsters to attack the mansion, Muffin, Sadie's pet cat reveal to be the cat goddess, Bast. Later that day, carrier demons and Serqet, the scorpion goddess, go after them. Bast distracts the goddess that is defeated by Zia Rashid and her magic ribbons. Zia makes a portal to take the Kane Siblings to the First Nome of the House of Life in Egypt.

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