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The 1990s

1997 (Y17) AD = 116  MM = 72  TR = 71  RH = 69  M = 39  BW = 27  CW = 25  PW = 21  FGW = 19  HG = 18  H&R = 17  GW = 16  

January 6
Harry's third lesson with [Dumbledore]Harry and [Dumbledore] together watch the memory of Tom Riddle returning to the Gaunt house and a fuzzy memory of Riddle asking Professor Slughorn about Horcruxes.
This happened the first day back from the Christmas holidays, and a "few days after New Year." On the HBP calendar, this is Monday, January 6.
(HBP17)
March 1
witches and wizards Ron's seventeenth birthdayShortly after waking up, Ron accidentally has some of [Romilda Vane]'s [love potion] - and after Slughorn provides him with an antidote, he inadvertently poisons Ron as well. Fortunately, Harry reacts quickly and gives Ron a bezoar, saving his life.
(HBP18)
March 10
Harry's fourth lesson with [Dumbledore]Harry arrives at his lesson with [Dumbledore] having forgotten to do his homework and get the full memory from Slughorn. They watch several memories, including Voldemort's applying to teach Defence Against the Dark Arts, and [Dumbledore] warns Harry that further lessons will be useless without the memory from Slughorn.
(HBP20)
April 21
herbology Slug Club witches and wizards Horace Slughorn finally gives up his memory to Harry - thanks to [Felix Felicis] (HBP22)He races to [Dumbledore]'s study at midnight and together they watch the full memory, discussing Voldemort, Horcruxes, and the [prophecy] - along with how Harry is going to react to all three (HBP23).
We know this happens on April 21 because [Apparition] tests were the same day, and the sign posted in the Gryffindor common room in HBP21 specified the date. This works well with our calendar, too; the 21st is a Monday, we already know from HBP9 that Harry has Potions on Mondays, and most of his lessons with [Dumbledore] have happened on Mondays as well.
circa May
Death Eaters witches and wizards Harry uses the [Sectumsempra] curse on MalfoySnape quickly arrives to heal Malfoy, but Harry lands in detention every Saturday for the rest of the year.
(HBP24)
May
witches and wizards Harry serves his first detention with Snape; meanwhile, Gryffindor wins the [Quidditch Cup]Harry returns to Gryffindor Tower after his detention to find a massive celebration - and immediately kisses Ginny in front of everybody.
(JKR)
June
Death Eaters herbology witches and wizards Harry and [Dumbledore] retrieve the fake Horcrux from inside Voldemort's sea [cave]We are given no indication of the date, except that it's June.
(HBP26)
June
battles D.A. Spells Dark Magic Death Eaters history & timelines Hogwarts School of Witchcraft and Wizardry Medical Order of the Phoenix portrait, tapestry, sculpture witches and wizards The Battle of The TowerWhile [Dumbledore] is away, a gang of [Death Eaters], led by [Draco Malfoy], sneaks into [Hogwarts] through the [vanishing cabinet] in the [Room of Requirement]. They battle the [Order of the Phoenix], and when [Dumbledore] and [Harry] return, Dumbledore freezes Harry and [Draco] arrives to [Disarm] [Dumbledore] ([HBP27]).

After a standoff, [Snape] arrives and kills [Dumbledore], and the [Death Eaters] flee the school. [Harry] then discovers that the [locket] is not the real [Horcrux], but rather that it was replaced by a fake one from [R.A.B.] ([HBP28]).

[McGonagall], now acting as headmaster, meets with the [Order] and with the [heads of houses], determining that students will be allowed to stay for [Dumbledore]\'s funeral ([HBP29]).
June
Hogwarts School of Witchcraft and Wizardry Ministry of Magic witches and wizards [Dumbledore]'s funeralMuch of the British Wizarding World comes to Hogwarts to bid farewell to the "greatest headmaster Hogwarts ever had."

After rejecting Scrimgeour again and breaking ties with Ginny, Harry walks off with Ron and Hermione. He pledges to find the Horcruxes himself, and they pledge to stand with him the whole time.
(HBP30)
July 1
books and authors Harry Potter and the Philosopher's Stone is publishedIt is published only in Britain until the following year.
late July 27
battles Broomsticks Spells Dark Magic Death Eaters Medical Order of the Phoenix potions Battle of the Seven Potters
The [Order of the Phoenix] attempts to release Harry from [Privet Drive] only to be ambushed by [Death Eaters]. An aerial battle ensues which ranges over the southern counties of England between [Little Whinging] and the [Burrow].
August 1
battles buildings Death Eaters history & timelines music, rhymes, and dance The Wedding
[Fleur Delacour] and [Bill Weasley] get married. The reception is broken up by a [Death Eater] attack.
August 2

(Kreacher) tells (Harry Potter) the tale of how he was told to go with the (Dark Lord)by his master (Regulus Black) and how he failed his master by not destroying the locket.

1998 (Y18) AD = 117  MM = 73  TR = 72  RH = 70  M = 40  BW = 28  CW = 26  PW = 22  FGW = 20  HG = 19  H&R = 18  GW = 17  

July
books and authors Harry Potter and the Chamber of Secrets is publishedIt will not be released in the U.S. until the following year.
July 31
[Jo Rowling] publishes the first Daily Prophet newsletter for members of her fan club
September 1
Harry Potter and the Sorcerer's Stone is published in the U.S.

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