The On-Island Timeline

DAY 1 (1x1, 2x7, 2x23) [Wednesday September 22, 2004]

Obviously the plane crashes on the first day on the island, confirmed in 2x7, and we find out in 2x23 that the plane crashed on September 22, 2004.
1x1 contains a shot at night, signaling the end of the first day
2x7 The tailies are attacked at night of day 1

DAY 2 (1x1, 1x2, 1x3, 2x7) [Thursday September 23, 2004]

2x7, Eko starts creating stick
The survivors discover french transmission during second day - there are several references to YESTERDAY and the plane crash is said to have taken place 16 HOURS AGO
1x3 picks up where 1x2 left off, with the survivors returning to the beach as it is getting DARK having heard the french transmission, when they camp out in the jungle for the night

DAY 3 (1x3, 2x7) [Friday September 24, 2004]

1x3 spans into the next day when the survivors return to the beach the following morning
2x7 Donald is getting worse

DAY 4 (1x3, 1x4) [Saturday September 25, 2004]

1x3 spans into a third day, the morning after the marshal dies.
Jack confirms this when he tells Kate they all died THREE DAYS AGO
In 1x4 Boars awake the survivors in the NIGHT and Jack says it has been 4 DAYS since the crash

DAY 5 (1x4, 2x7) [Sunday September 26, 2004]

2x7 Donald is buried
The bodies are burned the night of 1x4, indicating the end of day 5
According to 1x6, Michael finds Jin's watch on this day

DAY 6 (1x5) [Monday September 27, 2004]

Twice Jack says it has been 6 DAYS since the crash - most likely this statement is made ON day 6, but could be day 7
1x5 ends at NIGHT, signaling the end of this day
Sayid confirms Joanna drowned on day 6 in 1x21

DAY 7 (1x6, 2x7) [Tuesday September 28, 2004]

2x7 tailies catch chicken
It is assumed that 1x6 is the NEXT DAY after 1x5, as it starts with Jack and Kate collecting water for the survivors from the caves that Jack found in 1x5
1x6 ends at NIGHT, signaling the end of this day
Michael tells Jin he found the watch TWO DAYS AGO = DAY 5

DAY 8 (1x8) [Wednesday September 29, 2004]

According to 1x8, Shannon's inhaler ran out on this day

DAY 9 (1x7) [Thursday September 30, 2004]

Kate tells Jack they crashed EIGHT DAYS AGO
1x7 ends at night, signaling the end of this day

DAY 10 (1x8) [Friday October 1, 2004]

In 1x8, Sayid asks Locke where he was LAST NIGHT when he was hit in the head (in 1x7). This means the events in 1x8 take place the DAY AFTER the events in 1x7
Boone says Shannon's inhaler ran out a COUPLE OF DAYS AGO = DAY 8
Jack and Sawyer fight at night, signaling the end of this day

DAY 11 (1x8) [Saturday October 2, 2004

1x8 continues into the next day
Sayid leaves in this episode

DAY 12 (2x7) [Sunday October 3, 2004]

Tailies attacked second time, Ana later refers to the two attacks as two weeks apart

DAY 13 (1x9, 2x7) [Monday October 4, 2004]

Tailies abandon beach and hike into jungle after 2nd attack in 2x7
Kate says it HAS BEEN 2 DAYS since Sayid left - likely Day 12, could also be 13
It is day when this episode starts, then night, indicating one day has passed.

DAY 14 (1x9) [Tuesday October 5, 2004]

1x9 Continues into the following day
Danielle lets Sayid go

DAY 15 (2x7) [Wednesday October 6, 2004]

Tailies make second camp in jungle

DAY 16 (1x10) [Thursday October 7, 2004]

Claire has nightmare in the early hours of the morning
Kate says SAYID has been gone ALMOST A WEEK - so it most likely is 5-6 days after he left on Day 11
Claire is attacked at night

DAY 17 (1x10, 1x11, 2x7) [Friday October 8, 2004]

2x7, Ana digs pit
1x10 continues into the next DAY, Hurley begins his census
Sayid returns to camp
1x11 picks up where 1x10 leaves off, and Ethan takes Claire
Locke and Boone find hatch at NIGHT, signaling end of day

DAY 19 (2x7) [Sunday October 10, 2004]

Ana throws Nathan in pit

LABOR DAY [Monday October 11, 2004]

DAY 22 (1x12) [Wednesday October 13, 2004]

Shannon says that Boone and Locke have been going to the hatch from SUNRISE to SUNSET the PAST 4 DAYS

DAY 23 (1x12, 2x7) [Thursday October 14, 2004]

Goodwin frees Nathan, kills him. Tells Ana that Nathan has been in the pit 4 DAYS

1x12 spans into a second day, Boone and Shannon argue at night. Kate tries to steal the case from Sawyer the next morning.

DAY 24 (2x7) [Friday October 15, 2004]

Tailies abandon second camp after Nathan is found to be missing

DAY 25 (1x13) [Saturday October 16, 2004]

Boone says that he and Locke have been coming out and staring at the hatch for TWO DAYS
1x13 ends at NIGHT, signaling the end of the day

DAY 26 (1x14) [Sunday October 17, 2004]

1x14 starts during the DAY, then goes to NIGHT, and continues into the following day

DAY 27 (1x14, 1x15, 2x7) [Monday October 18, 2004]

Tailies find Arrow Station, Goodwin killed by Ana in 2x7

1x14 Charlie says Claire has been gone over a week = DAY 25+
1x14 Michael's hospitals drawing were done for Walt's 2nd bday, was in hospital 1 week before Walt's bday
Claire returns at NIGHT, end of day.
1x15 picks up where 1x14 left off, with Claire returning to the survivors. The night passes and transitions into the next day.

DAY 28 (1x15) [Tuesday October 19, 2004]

1x15 starts the same day as 1x14, then moves into the next day
Jack says the crash was ALMOST A MONTH AGO - places 1x15 BEFORE 10-22-04
Survivors set up perimeter at night after hearing about Ethan's threat, signaling the end of his day

DAY 29 (1x15) [Wednesday October 20, 2004]

Scott is found dead in 1x15 in the morning - even though Ethan told Charlie he had until sundown to return Claire
Jack hands out guns and Ethan is killed
This episode ends at night, signaling the end of this day

DAY 30 (1x16) [Thursday October 21, 2004]

Sawyer attacked by boar in early MORNING
Kate returns gun and says thanks for the loaner
Charlie is making shovel and starts digging grave
Sawyer and Kate camp for night tracking boar, signaling end of day

DAY 31 (1x16) [Friday October 22, 2004]

Sawyer returns gun to Jack, who says he asked for it 2 DAYS AGO

DAY 32 (1x17) [Saturday October 23, 2004]

Walt burns the raft at night, signaling the end of this day

DAY 33 (1x17) [Sunday October 24, 2004]

Sawyer refers to the crash as happening about a MONTH AGO
Walt confesses to Locke at night, signaling end of this day

DAY 34 (1x17) [Monday October 25, 2004]

Jin begins helping Michael with Raft II the next morning

DAY 35 (1x18) [Tuesday October 26, 2004

Claire says she is nearly 9 months pregnant

DAY 39 (1x19) [Saturday October 30, 2004]

Boone and Locke try opening hatch with Trebuchet. That NIGHT, Locke tests his wound and realizes he has lost feeling in his legs
Boone says they have been coming to the hatch for TWO WEEKS

DAY 40 (1x19) [Sundary October 31, 2004] HALLOWEEN

Locke begins rebuilding trebuchet, Boone quits. That NIGHT, Locke has his dream vision of the beechcraft

DAY 41 (1x19, 1x20, 2x7) [Monday November 1, 2004]

2x7, Eko breaks 40 days of silence. Boone and Bernard talk on radio.
In 1x19, Locke wakes Boone up in the morning, and they set out to find the beechcraft
Lock brings Boone back to Jack, Boone dies that night - NOTE 1x19 shows Locke at the hatch at night, but close inspection of 1x20 shows that 1x20 goes back and picks up prior to that, with Boone dying the same night Locke pounds on the hatch

DAY 42 (1x20, 1x21) [Tuesday November 2, 2004]

Shannon and Sayid return from their date the previous night, and are informed of Boone's death
1x21 picks up on same day, with Shannon visiting Boone's body
This episode ends at night, signaling the end of this day

DAY 43 (1x22) [Wednesday November 3, 2004]

Locke tells Jack he found the hatch 3 WEEKS AGO, GIVE OR TAKE - 3 weeks would be about day 38
This episode ends at night, signaling the end of this day

DAY 44 (1x23, 1x24, 2x1, 2x2) [Thursday November 4, 2004]

Danielle arrives to warn that the OTHERS are coming in the morning
Raft sets sail
Hatch blown open at NIGHT
2x1 continues where 1x24 ended - the hatch being blown open
Kate, then Locke, then Jack go into the hatch late at night, possibly after midnight, which would be early the next morning
2x2 goes back in time a litle and picks up at night when Walt is taken, it also explores what happend when Locke went into the hatch (before Jack showed up)
Locke tells Desmond the plan crash was 44 DAYS AGO - this is said during the night between day 44 and 45, so makes perfect sense

DAY 45 (2x2, 2x3, 2x7) [Friday November 5, 2004]

Captions in 2x7 indicated events within the episode that take place on this day
In 2x7 Jin's body washes up on shore
2x2 continues into the next day, when Michael and Sawyer make it to land, and Jin comes running towards them
2x3 picks up right where 2x2 left off, with the Tailies taking Michael, Sawyer and Jin captive
2x3 Desmond flees
Hurley and Sayid brought to hatch

DAY 46 (2x4, 2x7) [Saturday November 6, 2004]

Captions in 2x7 indicated events within the episode that take place on this day - Tailies let survivors out of pit
In 2x4, we see the fusies let out of the pit, from 2x7, we know this is DAY 46
Charlie asks Hurley where he has been for a whole day and night, indicating Hurley spent the night between 45 and 46 in the hatch
Bottle found by Claire, Rose brought to hatch
2x4 ends at night, signaling end of day

DAY 47 (2x5, 2x6, 2x7) [Sundary November 7, 2004

Sun says it has BEEN 4 DAYS since RAFT LEFT on day 44 - this could mean day 47 or 48, but other evidence indicates it must be day 47
2x5, tailies start preparing for hike back to fusies camp
2x7 confirms the tailies begin their journey on day 47
2x6 starts on the night of day 47, and continues into the next day

DAY 48 (2x6, 2x7, 2x8) [Monday November 8, 2004]

2x6 starts during the night of day 47, then continues into events the next day
2x6 Michaels says that the others live A DAY BACK THAT WAY, indicating they have been hiking for a day
Ana says there were 2 weeks between the first attack and second attack of the others
2x6 Ana shoots Shannon, confirmed by 2x7
2x8 Picks up where 2x7 leaves off, with Shannon just having been shot and Sayid going after Ana
Sayid says he tortured Sawyer almost 40 DAYS AGO. 40 DAYS would be DAY 51

DAY 49 (2x9) [Tuesday November 9, 2004]

Evidence at the beginning indicates this is the morning following 2x8 - Jin is seen stretching after his first night back with Sun, Jack tells Sawyer that Kate has been watching him for the last 24 hours straight, Sayid is preparing to bury Shannon

DAY 49 (2x10) [Tuesday November 9, 2004]

It is not clear how much time passes between 2x9 and 2x10, I'm assuming one day because of the time Eko's trip to find and burn the plane would have taken in 2x10. However, assuming the info about S2 taking 65 days is correct, this means that 2x10 takes place on the same day as 2x9.

DAY 50 (2x11) [Wednesday November 10, 2004]

Hurley tells Charlie "Dude, it's been a day [since Claire dumped you]", meaning events in 2x11 are one day after events in 2x10. This is the episode where we see Michael lock Jack and Locke up and take off after Walt. Jack tells Mr. Friendly they have been on the island 50 days.
Michael takes off on this day after locking up Jack and Locke, 13 DAYS AGO in relation to 2x22

DAY 51 (2x11) [Thursday November 11, 2004] VETERANS DAY

When Jack and company encounter Mr. Friendly, it is night. When they arrive back to the main camp, still in 2x11, it is day, indicating a day has passed during their trek

DAY 52 (2x12) [Friday November 12, 2004]

It's not clear when the events of 2x12 take place. Could possibly pick up on same day 2x11 ends. Charlie takes the baby during his dream at night, indicating the passing of one day in this episode.

DAY 52 (2x22) [Friday November 12, 2004]

Michael is taken OTHERS' camp "11 days ago" from events in real-time in 2x22. This means it must be 2 DAYS after he left, on day 50.

DAY 53 (2x12) [Saturday November 13, 2004]

Charlie starts fire and takes Aaron at night

DAY 54 (2x12) [Sunday November 14, 2004]

Still in 2x12, Aaron and Claire are baptized

DAY 55 (2x13) [Monday November 15, 2004]

Could start on day 54
Ends at night, signaling end of day

[/li][/list]

Day 56 (2x14) [Tuesday November 16, 2004]

Rousseau captures The Prisoner and turns him over to Sayid.
Sayid brings The Prisoner to the hatch, where he tortures him.
The sun is setting when Sayid and Charlie talk, marking the end of DAY 56.

Day 57 (2x15) [Wednesday November 17, 2004]

Aaron becomes sick during the NIGHT and Claire wants to take him to the hatch to see Jack. Locke tells her it isn't safe, and that he'll go to the hatch and get Jack. In the hatch, Locke asks about The Prisoner, and Jack says that he hadn't made a sound all NIGHT. This seems to indicate it is the first night after DAY 56.
Locke asks The Prisoner if he needs to use the bathroom, he replies "No", and Locke tells him to let them know when he does. Later, we see Jack escorting The Prisoner to the bathroom. This also seems to indicate it is the first day after DAY 56.
Later the same day, Eko asks to speak to The Prisoner. He asks The Prisoner how long he has been in the armory, and The Prisoner responds "two days". It is later in the day when this happens, and it is unclear if he is counting the current day as one of the days, or if he is on his third day, and only counting the two previous days he has been in the armory.
There is an outdoor shot at the end of this episode showing the sun low in the sky, indicating it is towards the end of this day.

Day 58 (2x16) [Thursday November 18, 2004]

When Locke asks Ana to talk to the Prisoner, Ana says she has been with the main group of survivors for over a week. (Ana and the group arrived at Day 48 - so that makes this particular day DAY 56+).
Locke tells Ana The Prisoner has been in the hatch for 3 days. This seems to indicate it is the next day after the day depicted in 2x15. Again, though, it is unclear if Locke is counting the current day as one of the three days.
Ana gets The Prisoner to draw a map, and she sets out with Sayid and Charlie to find the balloon. They make it some ways, when it becomes dark, and they set up a camp for the NIGHT.

Day 59 (2x16) [Friday November 19, 2004]

The next MORNING (still episode 2x16), Ana, Sayid and Charlie continue their trek and find a clearing. In the hatch, Jack lets The Prisoner out for some BREAKFAST (cereal).
This episode covers two days, and ends on the MORNING of day 59.

Day 59 (2x17) [Friday November 19, 2004]

2x17 picks up right where 2x16 left off, with Gale still at the table with the cereal and Ana, Sayid and Charlie searching the clearing for the balloon.
Hurley tells Jack that Ana-Lucia took off into the jungle YESTERDAY (the first day covered in 2x16, day 58).
Jack is heading back to the hatch after his poker game at NIGHT, with Kate, when they find the parachute and supplies and run into Sayid, Charlie and Ana returning from their balloon hike
This episode ends at night, signaling the end of this day.

DAY 60 (2x18) [Saturday November 20, 2004]

During the MORNING, survivors pick apart the supplies dropped the previous NIGHT. Charlie asks if anyone heard a plane fly by last NIGHT.

DAY 60 (2x22) [Saturday November 20, 2004]

Michael makes deal with Bea Klugh and starts towards camp. This was "3 days ago" in relation to real-time events in 2x22, meaning

DAY 61 (2x19, 2x20) [Sunday, November 21, 2004]

Ana says The Prisoner hasn't eaten or talked in 2 DAYS (He last talked to Ana, Sayid and Locke in 2x18)
Bernard says they have been on the island 2 MONTHS
At NIGHT, Jack and Kate set up camp at the line they aren't suppose to cross. That night, Michael stumbles into their camp

DAY 62 (2x20, 2x21) [Monday November 22, 2004]

Backdating from 2x22, we find that Michael's shooting of Ana and Libby is most likely on day 62.
Ana tells Michael that The Prisoner has been in the hatch for over a week (if my count is right, it is actually only 6 days)
2x21 starts where 2x20 leaves off, just after Ana and Libby are shot
Eko and Locke go searching for ?, camp at night, signaling end of day

DAY 63 (2x21, 2x22) [Tuesday November 23, 2004]

2x21 continues into next day
Events that take place "today" in 2x22 are 13 days after the events in 2x11
Sawyer tells Jack that he gave him all the meds "two days ago". This doesn't really give us a good time reference. Although we know Jack won the rights to the meds in 1x17, one DAY X+3, Jack told Sawyer at that time that he would come back for the meds "later". It appears that Sawyer handed over all the meds on DAY X+6
Libby dies during day 64, end of 2x21
2x22 picks up on same day
2x23 starts on same day, Desmond says he was sailing for TWO AND HALF WEEKS. I have him fleeing on day 45, 18 days ago - about 2.5 weeks

DAY 64 (2x23) [Wednesday November 24, 2004]

Michael and gang set out to attack Others. Camp for the night, signaling end of day.

DAY 65 (2x23) [Thursday November 25, 2004] THANKSGIVING

Michal leads group into trap. Locke tells Desmond they have been on the island 60-65 days.

TIMELINE JUSTIFICATION CONTINUED HERE