Question: When was the novel published which features Dumbledore's Army?

Context paragraphs:
Valentine (novel): Valentine (1832) was a novel published by French author George Sand.  This was the second novel published in Sand's career as an independent author, the novel is notable for displaying many of Sand's preoccupations as an emerging novelist: love, social class, greed, liberty, and family ties.  Like many of Sand's novels, the novel takes its name from its title character Valentine, who is born into an aristocratic family but falls in love with the peasant farmer, Benedict.  Star-crossed lovers belonging to different social classes were to become a major theme in Sand's works, which interrogated what the author perceived as the hypocrisy and rigidity of social norms in the Restoration-period French republic.

The Violent Bear It Away: The Violent Bear It Away is a novel published in 1960 by American author Flannery O'Connor.  It is the second and final novel that she published.  The first chapter of the novel was published as the story "You Can't Be Any Poorer Than Dead" in the journal "New World Writing".  It is the story of Francis Tarwater, a fourteen-year-old boy who is trying to escape his destiny: the life of a prophet.  Like most of O'Connor's stories, the novel is filled with Catholic themes and dark images, making it a classic example of Southern Gothic literature.

Dumbledore's Army: Dumbledore's Army (or D.A. for short) is a fictional student organisation in J. K. Rowling's "Harry Potter" series that is founded by the main characters, Harry Potter, Ron Weasley and Hermione Granger, to stand up against the regime of Hogwarts High Inquisitor Dolores Umbridge, as well as to learn practical Defence Against the Dark Arts.  It was founded in the fifth book, "Harry Potter and the Order of the Phoenix".  Cho Chang conceives of the abbreviation "D.A." and Ginny Weasley conceives of the name "Dumbledore's Army".

A True Novel: A True Novel is a novel published in Japan in 2002 by Minae Mizumura.  The novel is a loose re-telling of Emily Brontë's "Wuthering Heights" set in post war Japan and was first serialized in the monthly literary journal "Shincho".  The English translation was published in two volumes in 2013 by Other Press, with a translation by Juliet Winters Carpenter.  The novel was published in English as part of the Japanese Literature Publishing Project initiated by the Agency for Cultural Affairs.

Harriet E. Wilson: Harriet E. Wilson (March 15, 1825 – June 28, 1900) is considered the first female African-American novelist, as well as the first African American of any gender to publish a novel on the North American continent.  Her novel "Our Nig, or Sketches from the Life of a Free Black" was published anonymously in 1859 in Boston, Massachusetts, and was not widely known.  The novel was discovered in 1982 by the scholar Henry Louis Gates, Jr., who documented it as the first African-American novel published in the United States.  The novel, "The Bondwoman's Narrative" by Hannah Crafts, published for the first time in 2002, may have been written before Wilson's book.

Soldiers' Pay: Soldiers' Pay is the first novel published by the American author William Faulkner.  It was originally published by Boni & Liveright on February 25, 1926.  It is unclear if Soldiers' Pay is the first novel written by Faulkner.  It is however the first novel published by the author.  Faulkner was working on two manuscripts while finishing Soldiers' Pay.

The Palm-Wine Drinkard: The Palm-Wine Drinkard (subtitled "and His Dead Palm-Wine Tapster in the Dead's Town") is a novel published in 1952 by the Nigerian author Amos Tutuola.  The first African novel published in English outside of Africa, this quest tale based on Yoruba folktales is written in a modified Yoruba English or Pidgin English.  In it, a man follows his brewer into the land of the dead, encountering many spirits and adventures.  The novel has always been controversial, inspiring both admiration and contempt among Western and Nigerian critics, but has emerged as one of the most important texts in the African literary canon, translated into over a dozen languages.

Sophia (novel): Sophia is a novel published in 1762 by Charlotte Lennox, a British novelist best known for her 1752 satirical novel "The Female Quixote".  Originally published in Lennox's periodical "The Lady's Museum" as "Harriet and Sophia" between 1760-1, this novel is only the second British novel to be serialized in a magazine, and the first one to be published this way by a woman.

Harry Potter and the Order of the Phoenix: Harry Potter and the Order of the Phoenix is the fifth and antepenultimate novel in the "Harry Potter" series, written by J. K. Rowling.  It follows Harry Potter's struggles through his fifth year at Hogwarts School of Witchcraft and Wizardry, including the surreptitious return of the antagonist Lord Voldemort, O.W.L. exams, and an obstructive Ministry of Magic.  The novel was published on 21 June 2003 by Bloomsbury in the United Kingdom, Scholastic in the United States, and Raincoast in Canada.  Five million copies were sold in the first 24 hours of publication.  It is the longest book of the series.

Marshall Plan (software): The Marshall Plan software is a novel writing software to assist in the technical aspects of novel writing.  The software automatically plots a novel based on literary agent Evan Marshall's novel writing system in his three book series, "The Marshall Plan for Novel Writing: A 16-Step Program Guaranteed to Take You From Idea to Completed Manuscript," "The Marshall Plan Workbook," and "The Marshall Plan for Getting Your Novel Published."  Marshall Plan software is published by Evan Marshall and Martha Jewett, literary agent and consultant.

Supporting paragraphs: Dumbledore's Army Harry Potter and the Order of the Phoenix
Answer: 21 June 2003