Timeline

Information regarding the actual date is vague but a relatively accurate timeline of events is possible.

Before the series
These are all of the events that were referenced/mentioned throughout the series that have happened prior to the landing of the 100 on Earth. All dates are backtracked from the confirmed date of the nuclear apocalypse, stated to have been in 2052. This is used as Ark Year 1 (year zero doesn't exist in common calendars), the first year people lived on the Ark.

In the series
Season One starts when the 100 were sent to Earth on Saturday, September 13, 2149 and is considered "Day 1."

Season Two begins a day after season one and ends on November 3, 2149.

Season Three begins after a time skip on January 27, 2150.

Season Four begins right after season three ends.

Season Five is set six years after the Second Nuclear Apocalypse but includes multiple flashbacks from the six year time skip.

Season Six pick up right after season five ends after Clarke Griffin and Bellamy Blake wake up after 125 years of cryosleep.


 * -|Season 1 =Season 1
 * -|Season 2 =Season 2
 * -|Season 3 =Season 3
 * -|Season 4 =Season 4
 * -|Season 5 =Season 5