For the curious, the actual text on the WB timeline (through the end of Year 2), contrasted with the text on the Lexicon's timeline and the text in the books, as well as notes on how the dates of events can be calculated.

For clarity, all year calculations are based on the fact that Halloween in CoS is Nearly Headless Nick's 500th death day party, and he died in 1492.

All bolding is mine. I've removed carriage returns from the official timeline (it was easiest to put this together in Excel, then copy it into an HTML table). I usually replaced linebreaks from the Lexicon's timeline with /, and I tried to clean those up. I may have missed a couple.

Lexicon MT: Information on the Lexicon Master Timeline for the series
Lexicon SS: Information on the Lexicon day calendar for Book 1, Harry Potter and the Sorcerer's Stone
Lexicon CS: Information on the Lexicon day calendar for Book 2, Harry Potter and the Chamber of Secrets.

Note that I'm pulling these out of the Wayback machine, so that I can compare the DVD timeline text with Lexicon timelines which predate the DVD release. The first timeline appeared on the Chamber of Secrets DVD, which was released in 4/2003. Therefore, the timelines I'm using are from the last Wayback save prior to that DVD release, which is 12/2002. This date is noted by each Lexicon timeline reference.

Books are referenced by similar abbreviations, along with chapter number (e.g., SS1 = Harry Potter and the Sorcerer's Stone, Chapter 1.)

The timeline is taken from the Prisoner of Azkaban DVD; I've done the "History," "Year 1", and "Year 2" timelines.


HISTORY:

Official Timeline	Lexicon timeline and/or day calendar	Text from the book	My comments
Circa 993: HOGWARTS FOUNDED by Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw & Salazar Slytherin	Lexicon MT, 12/02: before 993: Hogwarts founded by Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw, and Salazar Slytherin	"You all know, of course, that Hogwarts was founded over a thousand years ago - the precise date is uncertain - by the four greatest witches and wizards of the age. The four school Houses are named after them: Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw, and Salazar Slytherin. They built this castle together, far from prying Muggle eyes, for it was an age when magic was feared by common people, and witches and wizards suffered much persecution." (CS9)	The year is taken from 1993 - 1000 years; the text on both timelines matches, but both match Binns' speech in the novel. However, Binns' speech is situated between the attacks on Mrs Norris and Justin F-F, meaning that using 1993- 1000 is actually an error. Justin F-F was attacked on December 18, 1992 according to both timelines. Therefore, the year cited in both timelines should be 992, not 993.
October 31st 1492: Sir Nicholas de Mimsy-Porpington dies from near decapitation.	Lexicon MT, 12/02: October 31, 1492: Sir Nicholas deMimsy-Porpington beheaded (nearly)	...an enormous gray cake in the shape of a tombstone, with tar-like icing forming the words, Sir Nicholas de Mimsy-Porpington, died 31st October, 1492 (CS8)	As previously noted, this event is used to set the timelines for all novels.
1941-1942 Schoolyear: Lord Voldemort opens the Chamber of Secrets. Moaning Myrtle killed.	"Lexicon MT, 12/02 has this as 1942-3: September: Tom Riddle Jr. starts his fifth year at Hogwarts He is a prefect; he finally discovers how to open the Chamber of Secrets, and learns to control the Basilisk 1943: a student named Myrtle dies in a second floor bathroom after seeing the Basilisk"	"And Father won't tell me anything about the last time the Chamber was opened either. Of course, it was fifty years ago…" (CS12) "We know the person who opened the Chamber last time was expelled fifty years ago. We know T. M. Riddle got an award for special services to the school fifty years ago. ..." (CS13)	The year is taken from Valentine's Day in Chamber of Secrets - 50 years (1993-50=1943), but it should probably use Christmas in Chamber of Secrets - 50 years (1942), suggesting the official timeline is correct.
June 13th 1942: Hagrid expelled. Aragog escapes to the Forbidden Forest.	"Lexicon MT, 12/02: June 13, 1943: Hagrid expelled from Hogwarts after being falsely accused of opening the Chamber of Secrets Aragog the Acromantula is released into the Forest where he establishes a colony of the giant spiders"	"In my fifth year, the Chamber was opened and the monster attacked several students, finally killing one. I caught the person who opened the Chamber and he was expelled."(CS13) The pages of the diary began to blow as though caught in a high wind, stopping halfway through the month of June. Mouth hanging open, Harry saw that the little square for June thirteenth seemed to have turned into a miniscule television screen. (CS13)	The date is given directly in the book text; the word "expelled" is used in the book. There are no other notable similarities between the two timelines except the events themselves.
1945: Albus Dumbledore defeats the Dark Wizard Grindelwald.	Lexicon MT, 12/02: 1945: Dumbledore defeats the dark wizard Grindelwald	"'Dumbledore is particularly famous for his defeat of the dark wizard Grindelwald in 1945...'" (SS13)	The text in both timelines is a paraphrase of the novel text.
July 31st 1980: Harry Potter born to James and Lily Potter	Lexicon MT, 12/02: July 31, 1980: Harry Potter born		This date is twelve years prior to the events in Chamber of Secrets, and Harry's birthdate is stated repeatedly in text and on Rowling's website.
October 31st 1981: After Lord Voldemort kills Lily and James Potter, Hagrid rescues Harry and delivers him to his aunt and uncle on Privet Drive.	Lexicon MT, 12/02: October 31, 1981: Voldemort attempts to kill Harry Potter after murdering his parents, but his spell rebounds onto him. 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.	"Hagrid's bringing him." "You think it -- wise -- to trust Hagrid with something as important as this?" "I would trust Hagrid with my life," said Dumbledore. (SS1)	According to SS, Harry is one year old when his parents are murdered on Halloween, thus fixing the date and year. According to full text search, "rescue" is not used in the book in this context, suggesting it may have been copied from the Lexicon and rephrased slightly.

YEAR 1

Official Timeline	Lexicon timeline and/or day calendar	Text from the book	My comments
July 24th-30th: Letters to Harry Potter from Hogwarts arrive at the Dursleys' by the hundreds.	Lexicon MT, 12/02: July 24 - 30, 1991 - letters begin arriving via owl post to invite Harry to Hogwarts.		You can calculate the date by working backward. 1 letter arrives, then another the next day, then 3 letters, then 12 arrive on Friday. The next Tuesday is Harry's birthday, the 31st. This means that the first letter arrived on the 24th.
July 31st: Rubeus Hagrid rescues Harry, on his 11th birthday, from the Dursleys at the Hut-on-the-Rock.	Lexicon MT, 12/02: July 31, just after midnight - Hagrid rescues Harry from the Dursleys and from the Hut on the Rock	Monday. This reminded Harry of something. If it was Monday -- and you could usually count on Dudley to know the days the week, because of television -- then tomorrow, Tuesday, was Harry's eleventh birthday. Of course, his birthdays were never exactly fun -- last year, the Dursleys had given him a coat hanger and a pair of Uncle Vernon's old socks. Still, you weren't eleven every day. (SS3) Harry stretched out his hand at last to take the yellowish envelope, addressed in emerald green to Mr. H. Potter, The Floor, Hut-on-the-Rock, The Sea. (SS4)	This phrasing is almost entirely identical, and the use of the key verb "rescues" (which does not appear in the book) is telling. Note that the fact that Harry's birthday explicitly falls on a Tuesday in SS contradicts the fact that July 31st was a Wednesday in 1991.
July 31st: Hagrid takes Harry to Diagon Alley to purchase supplies for Hogwarts. After Harry withdraws money from Gringotts, he purchases his work robes, course books, cauldron, phials and a wand.	Lexicon SS, 12/02: Harry's 11th birthday Hagrid gives Harry his letter from Hogwarts Hagrid takes Harry to Diagon Alley to buy his things for Hogwarts Lexicon MT, 12/02: Harry and Hagrid visit Diagon Alley Hagrid retrieves the Philosopher's Stone from the Gringotts' high security vaults. Harry meets Draco Malfoy for the first time in Madam Malkin's Robes for All Occasions. Hagrid buys Hedwig for a birthday present for Harry.	"Best be Off, Harry, lots ter do today, gotta get up ter London an' buy all yer stuff fer school." (SS5) "Welcome," said Hagrid, "to Diagon Alley." (SS5)	The word "take" is not used in the book in describing Hagrid and Harry going to Diagon Alley. These actions are explicitly placed on Harry's birthday in the book.
September 1st: Harry Potter catches the Hogwarts Express from Platform 93/4 at Kings Cross. On board, Harry befriends Ron Weasley and Hermione Granger. The Sorting Hat places Harry, Hermione and Ron into Gryffindor House.	Lexicon SS, 12/02: Harry travels to Hogwarts on the Hogwarts Express Harry sorted into Gryffindor Dudley in London having his tail removed Lexicon MT, 12/02: Sunday, September 1st: Harry Potter, Hermione Granger, Ron Weasley, and Draco Malfoy start their first year at Hogwarts They catch the Hogwarts Express at 11 am at King's Cross Station, then travel until evening to Hogwarts. Harry meets Ron and Hermione on the train. Ron becomes his friend.	"Yer ticket fer Hogwarts, he said. "First o' September -- King's Cross -- it's all on yer ticket. Any problems with the Dursleys, send me a letter with yer owl, she'll know where to find me.... See yeh soon, Harry." (SS5)	This date is explicitly stated in McGonagall's letter to Harry. The WB timeline is inaccurate; Harry does not befriend Hermione at this point in the book. The word "catch" is not used in this book for the train, but does use it in Chamber of Secrets (Harry had caught the Hogwarts Express the previous year.(CS4)). The official timeline has a typographical error (omitted apostrophe in King's Cross) which does not appear on the Lexicon.
September 7th: Harry has tea with Hagrid in his hut near the Forbidden Forest.	Lexicon SS, 12/02: September 7: morning: double potions wth Slytherins (first class)/afternoon off, tea with Hagrid at 3 [NB: in later versions of the Lexicon day calendar, this was changed to September 6]	Dear Harry, I know you get Friday afternoons off, so would you like to come and have a cup of tea with me around three? I want to hear all about your first week. Send us an answer back with Hedwig. Hagrid Harry borrowed Ron's quill, scribbled Yes, please, see you later on the back of the note, and sent Hedwig off again. It was lucky that Harry had tea with Hagrid to look forward to, because the Potions lesson turned out to be the worst thing that had happened to him so far. (SS8)	This event occurs in the afternoon of the first Friday after the start of term. According to a 1991 calendar, that should make it September 6. This is the "date error" alleged by SVA and RDR. However, as previously noted, the book calendar does not conform exactly to the 1991 calendar. If it is shifted back by a day to allow for Harry's birthday (July 31) to occur on a Tuesday, September 7 is the first Friday after the start of term. Therefore, this date "error" can only be significant in combination with other information.
HALLOWEEN October 31st: The Halloween Feast is interrupted by a Mountain Troll who nearly kills Hermione, but is defeated by Harry and Ron.	Lexicon MT, 12/02: Halloween Feast/The feast is interrupted by a Mountain Troll which almost kills Hermione Granger; she is saved by Harry and Ron, after which they become friends	"If they hadn't found me, I'd be dead now. Harry stuck his wand up its nose and Ron knocked it out with its own club. They didn't have time to come and fetch anyone. It was about to finish me off when they arrived." (SS10)	The use of "interrupted" and "nearly kills" is very close to the Lexicon's "interrupted" and "almost kills." Neither phrase appears in the book text. This event is specifically indicated to have taken place on Halloween.
November 9th: Gryffindor beats Slytherin in a Quidditch match when Harry catches the Golden Snitch in his mouth.	Lexicon SS, 12/02: November 9: Quidditch: Gryffindor vs. Slytherin, 11am Gryffindor wins when Harry catches the Snitch in his mouth Snape counters Quirrell's jinxes and saves Harry's life	The Quidditch season had begun. On Saturday, Harry would be playing in his first match after weeks of training: Gryffindor versus Slytherin. If Gryffindor won, they would move up into second place in the house championship. (SS11) Harry was speeding toward the ground when the crowd saw him clap his hand to his mouth as though he was about to be sick -- he hit the field on all fours -- coughed -- and something gold fell into his hand. "I've got the Snitch!"" he shouted, waving it above his head, and the game ended in complete confusion.(SS11)	This entry is significant in combination with the information for September 7th. September 7th should be a Friday in a calendar where July 31st is a Tuesday. Unfortunately, in the same calendar, November 9th would also be a Friday. The Quidditch game is explicitly stated to occur on a Saturday in the novel, and is implied to be in November, though no exact date is given. Presumably the Lexicon infers 11/9 because the text indicates that several days (at least) have passed between the defeat of the troll on 10/31 and the first Quidditch match on a Saturday in November (Hermione has been helping Harry with his homework, has lent him a book he's read, and "[has] become a bit more relaxed about breaking rules."(SS11)) This suggests that the Lexicon deduced the date of November 9th from their own calendar. This entry makes the September 7th date error indicative that the information was actually copied from the Lexicon, because it cannot be derived independently by WB using a "shifted" calendar, or the date would be November 10th. The phrasing of both entries is also almost entirely identical.
CHRISTMAS December 25th: Harry receives his father's Invisibility Cloak as a present. He discovers the Mirror of Erised and sees his parents again.	Lexicon MT, 12/02: Harry receives his father's Invisibility Cloak as a Christmas present from Dumbledore. Harry discovers the Mirror of Erised and sees his family for the first time. Lexicon SS, 12/02: CHRISTMAS Harry receives his father's Invisibility Cloak for a present Harry discovers the Mirror of Erised	"You, too," said Harry. "Will you look at this? I've got some presents!" ... "It's an invisibility cloak," said Ron, a look of awe on his face. "I'm sure it is -- try it on." ... Your father left this in my possession before he died. It is time it was returned to you. Use it well. (SS12) He had seen his parents and would be seeing them again tonight.(SS12) "So," said Dumbledore, slipping off the desk to sit on the floor with Harry, "you, like hundreds before you, have discovered the delights of the Mirror of Erised." (SS12)	This phrasing is almost entirely identical, with the keywords being "receives","his father's invisibility cloak", "as a present", and "discovers the Mirror of Erised and sees." However, with the exception of "receives," all of these words are duplicated in the book.
June 4th: Harry, Ron and Hermione follow Quirrell through the trapdoor, which leads them to a giant game of Wizard Chess. Ron successfully guides Harry and Hermione through. Harry learns Lord Voldemort lives within Quirrell and seeks the Sorcerer's Stone as his "Elixir of Life" to create a new body.	Lexicon MT, 12/02: Harry, Hermione, and Ron follow Quirrell after the Sorcerer's Stone, overcome the various protections, and defeat Quirrell Voldemort's attempt to steal the Stone Lexicon SS, 12/02: exams/last one: History of Magic evening:Harry, Ron, and Hermione follow Quirrell into the trap door after the Stone	Chapter title: THROUGH THE TRAPDOOR, Harry, Ron, and Hermione enter the trap door in this order (SS16)	This date is apparently not given in the text, and would appear to have been deduced by the Lexicon, presumably making the assumption that exams were scheduled to begin on June 1st during this school year, as they would the next year, then adding each explicitly-listed exam day to June 1st.
June 8th: With the addition of 170 extra points, Gryffindor upsets Slytherin in the House Cup.	Lexicon MT, 12/02: End of Term Feast - Gryffindor win House Cup (but not the Quidditch Cup) Lexicon SS, 12/02: Harry released from hospital end-of-year feast at which Gryffindor wins the house cup		Harry has been in the hospital wing for three days, then attends the feast the following day, so this event takes place four days after the previous events.

YEAR 2

Official Timeline	Lexicon timeline and/or day calendar	Text from the book	My comments
July 31st: Harry Potter's 12th Birthday. Dobby, the Malfoys' house-elf, visits Harry at the Dursleys' and warns: "HARRY POTTER MUST NOT GO BACK TO HOGWARTS"	Lexicon MT, 12/02: July 31: Dobby the house elf visits Harry Potter in Privet Drive The Dursleys hold a dinner party for the Masons which is disrupted by a falling violet pudding. Harry is sent a warning letter from the Ministry, reminding him that he is not allowed to do magic outside of school.	"Dobby, sir. Just Dobby. Dobby the house-elf," said the creature. (CS2)	This event takes place on Harry's birthday, assigning it a specific date. The word "visit" is not used in the chapter itself in this context, and the phrasing in the two timelines is nearly identical.
August 3rd: Ron Weasley, with brothers Fred and George, helps Harry escape the Dursleys in a Flying Ford Anglia.	Lexicon MT, 12/02: Early August: Ron rescues Harry from the Dursleys in a flying car Lexicon CS, 12/02: August 4th: nine Ministry raids overnight/Harry rescued by flying car	The following morning, he paid a man to fit bars on Harry's window. He himself fitted a cat- flap in the bedroom door, so that small amounts of food could be pushed inside three times a day. They let Harry out to use the bathroom morning and evening. Otherwise, he was locked in his room around the clock. Three days later, the Dursleys were showing no sign of relenting, and Harry couldn't see any way out of his situation. He lay on his bed watching the sun sinking behind the bars on the window and wondered miserably what was going to happen to him. (CS2)	Bars are put on the window on 8/1, three days later would be 8/4 (or possibly early in the morning of 8/5, since they arrive and have breakfast). The current Lexicon calendar was altered to place this event on 8/3 to match the official timeline, but the original date was probably correct.
August 19th: On his way to Diagon Alley, via Floo Powder from the Weasley's Fireplace, Harry accidentally arrives at Borgin and Burkes in Knockturn Alley. Lucius Malfoy slips Tom Riddle's diary into Ginny Weasley's cauldron.	Lexicon CS, 12/02: trip to Diagon Alley Harry accidentally visits Knockturn Alley Lockhart book signing at Flourish & Blotts	Harry heard from Hogwarts one sunny morning about a week after he had arrived at the Burrow. He and Ron went down to breakfast to find Mr. and Mrs. Weasley and Ginny already sitting at the kitchen table.(CS4) Mrs. Weasley woke them all early the following Wednesday.(CS4) "I realized that," said Harry, ducking as Hagrid made to brush him off again. "I told you, I was lost - what were you doing down there, anyway?" (CS4)	Both phrases use "accidentally." The book does not; it repeatedly uses the word "lost." This event is not explicitly dated in the book, but takes place on the next Wednesday after Harry has been at the burrow around a week. If Harry arrives on the morning of the 5th (a Wednesday in 1992), then the post from Hogwarts arrives around the 12th. This is also a Wednesday, so "the following Wednesday" would be the 19th. Even if Harry's arrival is shifted back a day to Tuesday, "about a week" is not exact, so someone else calculating independently could equally well get August 19th.
September 1st: After missing the Hogwarts Express, Harry and Ron fly the Ford Anglia to Hogwarts, where they crash into the Whomping Willow.	Lexicon MT, 12/02: Harry and Ron miss the Hogwarts Express and fly Mr. Weasley's bewitched car to Hogwarts Harry and his friends starts their second year at Hogwarts, Ginny Weasley and Colin Creevy start their first year Lexicon CS, 12/02: trip on the Hogwarts Express barrier closed Ron and Harry travel by flying car to school Ginny Weasley is Sorted into Gryffindor	"We're going to miss the train," Ron whispered. "I don't understand why the gateway's sealed itself -" (CS5) "Can you believe our luck, though?" said Ron thickly through a mouthful of chicken and ham. "Fred and George must've flown that car five or six times and no Muggle ever saw them."(CS5) "Don't know when I've been more shocked. Flying a car to Hogwarts! Well, of course, I knew at once why you'd done it. Stood out a mile. Harry, Harry, Harry." (CS6)	substantial similarity between the Lexicon Master Timeline and the official WB timeline, but they're both slight rephrasings of the information in the text. The date is not explicitly given as September 1, but I believe Rowling said in an interview that the Hogwarts Express always left on September 1.
September 2nd: Mrs. Weasley sends Ron a Howler: "IF YOU PUT ANOTHER TOE OUT OF LINE, WE'LL BRING YOU STRAIGHT HOME!"	Lexicon CS, 12/02: first day of term/Ron receives a Howler from his mother	The next day, however, Harry barely grinned once.(CS6) "She's - she's sent me a Howler," said Ron faintly. (CS6)	This is dated as "the next day" after the arrival at school, and is therefore September 2.
September 3rd: Gilderoy Lockhart, Hogwarts' new Defense Against the Dark Arts teacher, unleashes Cornish Pixies, resulting in pandemonium.	Lexicon CS, 12/02: double herbology transfiguration lunch DADA (Cornish pixies)	But he had no time to dwell on this; Professor McGonagall was moving along the Gryffindor table, handing out course schedules. Harry took his and saw that they had double Herbology with the Hufflepuffs first. (CS6) By the end of the class, Harry, like everyone else, was sweaty, aching, and covered in earth. Everyone traipsed back to the castle for a quick wash and then the Gryffindors hurried off to Transfiguration. (CS6) Harry was relieved to hear the lunch bell.(CS6) "What've we got this afternoon?" said Harry, hastily changing the subject. "Defense Against the Dark Arts," said Hermione at once. (CS6) "Yes," he said dramatically. "Freshly caught Cornish pixies. " (CS6)	This should be the same day that Ron receives the Howler-- September 2. Both the Lexicon and official timeline are in error, which suggests that this information was copied from the Lexicon's timeline.
September 5th: Harry hears the basilisk's voice.	"Lexicon CS 12/02: dawn Quidditch practice Ron's slug attack detentions 8pm-midnight: Ron polishes trophies, Harry answers fan mail Harry hears the basilisk's voice for the first time"	So with one thing and another, Harry was quite glad to reach the weekend. He, Ron, and Hermione were planning to visit Hagrid on Saturday morning. Harry, however, was shaken awake several hours earlier than he would have liked by Oliver Wood, Captain of the Gryffindor Quidditch team. (CS7) "That - that voice that said - didn't you hear it?" (CS7)	This is Saturday after the first week of classes. In 1992, that is September 5. The phrasings are nearly identical, but are also only slight rearrangements of the information in the book.
September 19th: Hermione's 12th Birthday.	Lexicon CS, 12/02: Hermione's birthday		Note that this is incorrect in the official timeline. Per an interview, this should be Hermione's 13th birthday.
December 10th: Hermione steals bicorn horn and boomslang skin from Snape's office.	Lexicon CS, 12/02: double potions (afternoon) during which Hermione steals potion supplies from Snape's office	In the second week of December Professor McGonagall came around as usual, collecting names of those who would be staying at school for Christmas. Harry, Ron, and Hermione signed her list; they had heard that Malfoy was staying, which struck them as very suspicious. The holidays would be the perfect time to use the Polyjuice Potion and try to worm a confession out of him. Unfortunately, the potion was only half finished. They still needed the bicorn horn and the boomslang skin, and the only place they were going to get them was from Snape's private stores. Harry privately felt he'd rather face Slytherin's legendary monster than let Snape catch him robbing his office. "What we need," said Hermione briskly as Thursday afternoon's double Potions lesson loomed nearer, "is a diversion. Then one of us can sneak into Snape's office and take what we need." (CS11) "I think I'd better do the actual stealing," Hermione continued in a matter-of-fact tone. "You two will be expelled if you get into any more trouble, and I've got a clean record. So all you need to do is cause enough mayhem to keep Snape busy for five minutes or so." (CS11)	In 1992, the Thursday in the second week of December is December 10. While the words in both timelines are very similar, the key words also appear in the book text.
December 17th: During a duel with Draco, Harry speaks Parseltongue to a snake.	"Lexicon CS, 12/02: dueling club 8pm, Great Hall blizard begins"	A week later, Harry, Ron, and Hermione were walking across the entrance hall when they saw a small knot of people gathered around the notice board, reading a piece of parchment that had just been pinned up. Seamus Finnigan and Dean Thomas beckoned them over, looking excited. "They're starting a Dueling Club!" said Seamus. "First meeting tonight! I wouldn't mind dueling lessons; they might come in handy one of these days..."(CS11)	This is stated to be a week after the potions lesson where Hermione steals from Snape. Therefore, it takes place on December 17th.
December 18th: Justin Finch-Fletchley Petrified in 3rd Basilisk attack.	Lexicon CS, 12/02: blizzard covers school last herbology class of term cancelled second rooster killed third attack: Justin Fitch-Fletchley and Nearly Headless Nick petrified trasfiguration	Harry turned over. He'd see Justin the next day in Herbology and he'd explain that he'd been calling the snake off, not egging it on, which (he thought angrily, pummeling his pillow) any fool should have realized. (CS11) Justin Finch-Fletchley was lying on the floor, rigid and cold, a look of shock frozen on his face, his eyes staring blankly at the ceiling. And that wasn't all. Next to him was another figure, the strangest sight Harry had ever seen. (CS11)	This is stated to be "the next day" after the Dueling club. Therefore, it is December 18th.
CHRISTMAS December 25th: A victim of improper transformation, Hermione is partially changed into a cat. Harry and Ron drink the Polyjuice Potion, transforming into Crabbe and Goyle.	Lexicon MT, 12/02:Harry and Ron use Polyjuice Potion to "become" Crabbe and Goyle. They learn that Malfoy is NOT the heir of Slytherin. Hermione is victim of in incomplete transfiguration and goes to the Hospital Wing for the next month Hermione is accidentally changed partially into a cat She spends the next month in the hospital wing	Harry and Ron had barely finished their third helpings of Christmas pudding when Hermione ushered them out of the hall to finalize their plans for the evening. (CS12) Her face was covered in black fur. Her eyes had turned yellow and there were long, pointed ears poking through her hair. "It was a c-cat hair!" she howled. "M-Millicent Bulstrode m-must have a cat! And the p-potion isn't supposed to be used for animal transformations!"(CS12)	The phrase "victim of an improper transformation" is substantially similar to the Lexicon's "victim of in [sic] incomplete transfiguration", and the phrase "Hermione is partially changed into a cat" also appears in both timelines. These descriptions are never used in the book itself. The events are explicitly stated as occurring on Christmas in the text.
May 8th: Hermione is Petrified in 4th Basilisk attack. Curfew instated. Hagrid is sent to Azkaban as a precaution. Dumbledore is removed as Headmaster of Hogwarts.	Lexicon MT, 12/02: Hermione Granger and Penelope Clearwater are Petrified; Hogwarts Quidditch Cup is cancelled Hagrid is sent to Azkaban; Dumbledore is removed as headmaster of Hogwarts Lexicon CS, 12/02: Quidditch: Gryffindor vs. Hufflepuff match cancelled fourth attack: Hermione Grnager and Penelope Clearwater petrified Dumbledore removed as headmaster Hagrid taken to Azkaban	However, the training sessions were getting better, or at least drier, and the evening before Saturday's match he went up to his dormitory to drop off his broomstick feeling Gryffindor's chances for the Quidditch cup had never been better. (CS14) "Take me?" said Hagrid, who was trembling. "Take me where?" "For a short stretch only," said Fudge, not meeting Hagrid's eyes. "Not a punishment, Hagrid, more a precaution. If someone else is caught, you'll be let out with a full apology"/"Not Azkaban?" croaked Hagrid.(CS14) "The appointment -or suspension- of the headmaster is a matter for the governors, Fudge," said Mr. Malfoy smoothly. "And as Dumbledore has failed to stop these attacks-" (CS14)	Sentence order is identical; Hagrid "is sent to Azkaban" and Dumbledore "is removed as headmaster of Hogwarts". The book text indicates Hagrid is "taken" to Azkaban; Dumbledore is "suspended." This suggests the text was lifted from the Lexicon's timeline. No date is explicitly given for this attack in the book. However, Chapter 15 indicates that Malfoy is gloating two weeks later, and that, the next day, exams are stated to begin on June 1, which is one week away. That indicates that the attacks took place on a Saturday approximately three weeks prior to June 1. In 1993, this is May 8.
May 29th: Harry, Ron and Lockhart enter the Chamber of Secrets. Harry saves Ginny and defeats the Basilisk with the assistance of Fawkes.	Lexicon MT, 12/02: the spirit-form of Voldemort is defeated by Harry Potter in the Chamber of Secrets/Lexicon CS, 12/02: mandrakes are ready for cutting/Ginny taken into Chamber Harry, Ron, Lockhart enter Chamber at sunset Harry defeats Tom Riddle in the Chamber of Secrets	Three days before their first exam, Professor McGonagall made another announcement at breakfast. ... When the hubbub had subsided, Professor McGonagall said, "Professor Sprout has informed me that the Mandrakes are ready for cutting at last. Tonight, we will be able to revive those people who have been Petrified. I need hardly remind you all that one of them may well be able to tell us who, or what, attacked them. I am hopeful that this dreadful year will end with our catching the culprit." (CS16)	This event takes place three days prior to June 1, meaning May 29. The use of "enter" and "defeats" and nearly identical sentence structure is telling. Neither is used in this context in the text.
May 29th: Professor Sprout and Madam Pomfrey revive Basilisk victims, who are then released from the hospital. Gryffindor wins Hogwarts Cup.	Lexicon CS, 12/02: May 30th: Lucious Malfoy removed as school governor Dobby freed early AM feast all victims un-petrified Hagrid returns 3:30 AM	"We shall have to send all the students home tomorrow," said Professor McGonagall. "This is the end of Hogwarts. Dumbledore always said..." (CS16) Harry had been to several Hogwarts feasts, but never one quite like this. Everybody was in their pajamas, and the celebration lasted all night.(CS18)	These events take place the same day as the fight with the basilisk, or the students would have left. Lucius Malfoy arrives in the evening. All events should fall on May 29th.
May 30th: Dumbledore is reinstated as Headmaster. Dobby is freed when presented with Harry's sock from Lucius Malfoy. Hagrid returns from Azkaban.	Lexicon MT, 12/02: Lucius Malfoy is removed from the Board of Governors of Hogwarts, Hagrid and Dumbledore return to Hogwarts Dobby the House-Elf is freed from service to the Malfoy family Lexicon CS, 12/02: Lucious Malfoy removed as school governor Dobby freed early AM feast all victims un-petrified Hagrid returns 3:30 AM		The official timeline is incorrect, no matter how you slice it. Dobby is freed prior to Hermione being unpetrified and the feast where Gryffindor wins the Hogwarts cup.

I have not finished going through Prisoner of Azkaban. I probably won't, either, since I don't think I care enough.

Overall:

Yes, WB lifted the Lexicon's timeline calculations and some phrasings for the official DVD-ROM timelines. This must be true, given the correspondence in errors between the two timelines, as well as the matching descriptive language seen on a few occasions.

However, while this might well qualify as plagiarism, I doubt it even approaches copyright infringement. WB did not duplicate the Lexicon's layout-- which, since the Master Timeline follows a standard timeline format and the day calendars look like calendars with information written in the squares, aren't copyrightable anyway.

Much of the text in the Lexicon's timelines and day calendars is directly lifted or paraphrased from Rowling's books, and this is not indicated with quotes and exact citations. The calculations (even when there are errors) are not copyrightable. Most can be independently verified from information clearly available in the text. So, what's there to copyright? Really?

Therefore, however upset SVA may be about the lifted timelines, I really doubt he's got much legal standing in objecting to their use, and it still has absolutely nothing to do with whether the Lexicon can legally be published (probably not).