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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
[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
[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
[Harry] uses the [Sectumsempra] curse on [Malfoy][Snape] quickly arrives to heal [Malfoy], but [Harry] lands in [detention] every Saturday for the rest of the year.
(HBP24)
May
[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
[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
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
[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
[Harry Potter and the Philosopher's Stone] is publishedIt is published only in [Britain] until the following year.
late July 27
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
The Wedding
[Fleur Delacour] and [Bill Weasley] get married. The reception is broken up by a [Death Eater] attack.
August 2
Story of the Locket Revealed
London, Number Twelve, Grimmauld Place
[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.
September 1
New Hogwarts Headmaster
With Death Eaters in control of the Ministry, Severus Snape becomes headmaster of Hogwarts.
September 2
The Infiltration of the Ministry
Harry, Ron, and Hermione use Polyjuice Potion to impersonate Ministry Employees. They recover a Horcrux and make a narrow escape.

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
[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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