The 1900s
1907 (Y-73) AD = 26
(HBP13)
The 1920s
1925 (Y-55) AD = 44 MM = 0
[Dumbledore] says that Merope and Riddle were married about a year before Tom Marvolo Riddle was born, on December 31, 1926 [[Y-54]].
(HBP10)
1926 (Y-54) AD = 45 MM = 1 TR = 0
The date is deduced from being nine months before Voldemort's birth date. We know Riddle leaves her soon afterward because they were only married for "a few months."
(HBP10)
The older Tom Riddle had previously left Merope when he realized that she was a witch (HBP10), and the child is raised in the [orphanage] (HBP13).
Tom Marvolo Riddle said that he was sixteen years old at the time of Hagrid's expulsion from Hogwarts ([CS17]). Hagrid was expelled in his third year, which was fifty years ago from June of 1993 [[Y13]]. Tom was therefore 16 in 1943 [[Y-37]] - meaning his sixteenth birthday was New Year's Eve, 1942 [[Y-38]], and his date of birth was in 1926 [[Y-54]]. However, according to the official timeline ([CS/DVD]), Hagrid's expulsion was in June of 1942, not 1943, which means that Hagrid's expulsion from Hogwarts was actually fifty-ONE years before June of 1993 [[Y13]]. Riddle was 16, then, in June of 1942 [[Y-38]], and therefore was born in 1925 [[Y-55]]. Either date may be considered correct. However, since the Lexicon follows what is directly given in the books over other sources, the dates in this timeline are derived from a literal interpretation of fifty years.
New Year's Eve is given in HBP13. Depending on exactly when Merope Gaunt arrived at the orphanage, Tom may have been born on New Year's Eve or just after midnight, on New Year's Day. Since the book says New Year's Eve, however, that's what we go with here.
The 1930s
1938 (Y-42) AD = 57 MM = 13 TR = 12 RH = 10
This is based on Riddle's birthday of New Year's Eve, 1926 [[Y-54]].
1939 (Y-41) AD = 58 MM = 14 TR = 13 RH = 11
(CS17)
The 1940s
1940 (Y-40) AD = 59 MM = 15 TR = 14 RH = 12
Meanwhile, Tom Riddle is starting his third year, and Minerva McGonagall her fourth.
The year is based on Hagrid's birthdate of December 6, 1928 [[Y-52]].
1942 (Y-38) AD = 61 MM = 17 TR = 16 RH = 14
The dates are based on birthdays from 1925-1928 [[Y-55]-[Y-52]].
1943 (Y-37) AD = 62 MM = 18 TR = 17 RH = 15
(CS17)
(CS17)
The next day, Morfin is taken to [Azkaban], where he remains until his death.
"In the summer of his sixteenth year, he left the [orphanage] to which he returned annually and set off to find his Gaunt relatives... Meanwhile, in the village of Little Hangleton, a maid was running along the high street, screaming that there were three bodies lying in the drawing room of the big house: Tom Riddle Senior and his mother and father."
(HBP17)
(HBP23)
"I knew it wouldn't be safe to open the Chamber again while I was still at school. But I wasn't going to waste those long years I'd spent searching for it. I decided to leave behind a diary, preserving my sixteen-year-old self in its pages, so that one day, with luck, I would be able to lead another in my footsteps, and finish Salazar Slytherin's noble work" ([CS17]).
Tom says that he placed his "sixteen-year-old self" into the diary ([CS17]), so he must have done it in the fall after the summer when he killed the Riddles and before he turned 17 at the end of December. His conversation with Slughorn where he learned about Horcruxes must have taken place after school started that September, so the timeframe for the creation of the diary Horcrux is between September and December, 1943 [[Y-37]]. All along, Tom realized that [Dumbledore] was watching him closely (HBP23).
1944 (Y-36) AD = 63 MM = 19 TR = 18 RH = 16
1945 (Y-35) AD = 64 MM = 20 TR = 19 RH = 17
We don't know when this happened exactly, except that it was almost certainly within a few weeks of the end of school. Riddle gets the job at [Borgin and Burkes] "the next thing the staff knew," according to [Dumbledore].
(HBP20)
c. 1947 (Y-33)

We don't know exactly when this happened, but it is probably within a couple of years of Voldemort's leaving Hogwarts. It's possible this happened later than 1946 or 1947 [[Y-34] or [Y-33]], but unlikely that it happened sooner.
original artwork © [Makani] 2004, used by permission
(HBP20)
(HBP20)
The 1950s
c. 1957 (Y-23)
Again we don't know exactly when this happened, but since most evidence points to [Dumbledore] becoming headmaster in 1956 [[Y-24]], Voldemort couldn't have come looking for a job much sooner than this.
(HBP20)
The 1970s
Events of this decade:
During the 1970s, Voldemort began to gather followers who were eager for a share of his power. The closest followers of Voldemort were known as the Death Eaters. These years got progressively more dangerous and violent. As Voldemort's influence grew, some witches and wizards were controlled by the Imperius Curse and forced to commit atrocities, including the torture and murder of Muggles. Voldemort capitalized on the prejudice and distrust between the giants and the Wizarding World; the giants became Voldemort's followers and killed and tortured many people. The Dark Mark is used by Death Eaters to indicate a house where they have committed murder. No one dared to become friendly with strange witches and wizards, not knowing if they were Voldemort supporters. Hogwarts became one of the few safe places in the Wizarding World. Bartemius Crouch is head of the Department of Magical Law Enforcement; the Aurors are authorized to use drastic methods not differing greatly from the tactics used by the Death Eaters they fight
1970 (Y-10) AD = 89 MM = 45 TR = 44 RH = 42 M = 12 BW = 0
This comes from [Dumbledore]'s statement in PS1 that "we've had precious little to celebrate for eleven years." At that time it is November, 1981. Though we don't know exactly how Voldemort's ascent to power happened, it is probably safe to assume that it somehow took a big leap in 1970.
1979 (Y-1) AD = 98 MM = 54 TR = 53 RH = 51 M = 21 BW = 9 CW = 7 PW = 3 FGW = 1 HG = 0
"DON'T LIE!" bellowed Black. "YOU'D BEEN PASSING INFORMATION TO HIM FOR A YEAR BEFORE LILY AND JAMES DIED! YOU WERE HIS SPY!"
(PA19)
(BFT)
The 1980s
c. 1980 (Y0)
This interview had to have taken place sometime after July of 1979 in order for it to apply to Harry's birth in 1980 [[Y0]], and [Dumbledore] describes it as a "cold, wet night" (OP37). So it was likely made in the winter or early spring of 1979-1980 [[Y-1]-[Y0]].
We also know that Trelawney, in early September of 1995 [[Y15]], claimed she had held her post for "nearly sixteen years" (OP15), which would imply that she was hired in the middle of a school year. And then, [Dumbledore] says in June of 1996 [[Y16]] that the interview was "sixteen years ago" (OP37). So unless [Dumbledore] is wrong, the interview must have been in the first few months of 1980 [[Y0]] - sixteen years before [Dumbledore]'s statement, a slightly exaggerated 'nearly sixteen years' before Trelawney's, and during the time of year most likely to have a "cold, wet night."
1980 (Y0) AD = 99 MM = 55 TR = 54 RH = 52 M = 22 BW = 10 CW = 8 PW = 4 FGW = 2 HG = 1 H&R = 0

original artwork © [Clio Chiang], used by permission
(PS2)
1981 (Y1) AD = 100 MM = 56 TR = 55 RH = 53 M = 23 BW = 11 CW = 9 PW = 5 FGW = 3 HG = 2 H&R = 1 GW = 0
Voldemort, nearly dead and without physical form, retreats into the forests of Albania where he possess the bodies of various animals to survive for the next decade, waiting. Hagrid, on [Dumbledore]'s orders, goes to [Godric's Hollow] to rescue baby Harry from the ruins of the house.
(PS1)
The 1990s
1990 (Y10) AD = 109 MM = 65 TR = 64 RH = 62 M = 32 BW = 20 CW = 18 PW = 14 FGW = 12 HG = 11 H&R = 10 GW = 9
There is no specific canon reference to indicate which year Quirrell took off from teaching. However, [Dumbledore] specifically says in HBP20, "we have never been able to keep a Defence Against the Dark Arts teacher for longer than a year since I refused the post to Lord Voldemort." Therefore, since we know Quirrell taught in 1991-1992 [[Y11]-[Y12]], he could not have taught from 1990-1991 [[Y10]-[Y11]]. This, then, was almost certainly his year off.
However, Hagrid speaks of Quirrell's nervousness as the result of his year off, and if that year off had been the 1990-1991 [[Y10]-[Y11]] school year (the one immediately before Harry comes to Hogwarts), Hagrid seemingly wouldn't have known about Quirrell's altered behavior:
"Poor bloke. Brilliant mind. He was fine while he was studyin' outta books but then he took a year off ter get some firsthand experience...They say he met vampires in the Black Forest, and there was a nasty bit o' trouble with a hag--never been the same since. Scared of the students, scared of his own subject now..." (PS5)
This doesn't seem to align, but it is possible that Hagrid is just talking about the month or two since Quirrell has returned from Albania. And if we take [Dumbledore] at his word, nothing else really makes sense.
1991 (Y11) AD = 110 MM = 66 TR = 65 RH = 63 M = 33 BW = 21 CW = 19 PW = 15 FGW = 13 HG = 12 H&R = 11 GW = 10
(PS17)
1992 (Y12) AD = 111 MM = 67 TR = 66 RH = 64 M = 34 BW = 22 CW = 20 PW = 16 FGW = 14 HG = 13 H&R = 12 GW = 11
The dates of this event are contingent on the dates of exams in Harry's first year. We are given dates for exams in books two and three--the first week of June--but that doesn't seem to be a hard and fast rule. The calendar for this book gives the date as June 4, based on the exam dates in the other books, but here on the timeline we'll play it a bit safer and just go with "early June."
(PS16)
(CS6)
This is about a week into the school year, so it didn't take Riddle long to force Ginny to open the Chamber.
(CS7)
1993 (Y13) AD = 112 MM = 68 TR = 67 RH = 65 M = 35 BW = 23 CW = 21 PW = 17 FGW = 15 HG = 14 H&R = 13 GW = 12

Later that night, the [Petrified] people are restored using [Mandrake Draught].
original artwork © [Agata Matteucci], used by permission
(CS17)
1994 (Y14) AD = 113 MM = 69 TR = 68 RH = 66 M = 36 BW = 24 CW = 22 PW = 18 FGW = 16 HG = 15 H&R = 14 GW = 13
Outside the shack, though, it's a full moon - and Lupin transforms into a werewolf. In the confusion, Pettigrew escapes ([PA20]) and spends the next months searching for Voldemort in Albania (GF1).
(GF1)
1995 (Y15) AD = 114 MM = 70 TR = 69 RH = 67 M = 37 BW = 25 CW = 23 PW = 19 FGW = 17 HG = 16 H&R = 15 GW = 14
Back at Hogwarts, it is revealed that [Barty Crouch Jr.], impersonating Moody all year, led Harry to Voldemort (GF35).
(GF36)
(OP21)
1996 (Y16) AD = 115 MM = 71 TR = 70 RH = 68 M = 38 BW = 26 CW = 24 PW = 20 FGW = 18 HG = 17 H&R = 16 GW = 15
- When [Minister for Magic] Cornelius Fudge refuses to step aside for Voldemort, the Brockdale Bridge is destroyed, killing dozens of Muggles.
- Amelia Bones, Head of [Magical Law Enforcement], and [Emmeline Vance], a member of the Order of the Phoenix, are murdered - the former by Voldemort himself.
- Destruction in Somerset is reported; Muggles suspect a hurricane, but it was probably the work of giants working for Voldemort.
- Dementors are breeding, causing cool weather and persistent mist across Britain.
- Cornelius Fudge is sacked and Rufus Scrimgeour, Head of the [Aurors], takes his place.
- A Junior Minister in the Muggle government, [Herbert Chorley], has a bad reaction to an [Imperius Curse] and thinks he's a duck. He is spirited away to St Mungo's] and [Kingsley Shacklebolt] takes a position as a secretary to the Muggle [Prime Minister] to guard him.
- Fudge visits the Muggle [Prime Minister] and introduces the him to Scrimgeour.
- Voldemort is furious with the failure of his Death Eaters to retrieve the [prophecy]. He assigns Draco Malfoy the task of killing [Dumbledore], at least in part to punish Lucius's failure, since Draco will almost certainly be killed.
- Narcissa Malfoy, followed by her sister Bellatrix, visits Severus Snape in his house on Spinner's End and get him to take the [Unbreakable Vow] that he will protect and Draco and, if necessary, kill [Dumbledore] for him.
- Harry spends two weeks at [number four, Privet Drive].
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
(HBP26)
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]).
