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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]

January

    • 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.

February

March

March 2012 - Events of The Hammer of Thor occur.

April

May

June

  • 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

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 was to Leto and Zeus in the island of Delos.

August

  • 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

  • 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.

October

November

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

December




  • 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 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 where they discover being the blood of the pharaohs and magicians.

Trivia

  • The Battle of the Labyrinth is the only book in either series that are impossible to tell exactly when they take place, as no identifying dates are mentioned. However, the book takes place during the summer.

References