- 1970
- July
- July 19, 1970
- Helena Gray Smith born in Boulder, Colorado.
- 1986
- January
- January 28, 1986
- Lenore watches the Challenger disaster on a TV on a rolling stand in her dentist's office.
- October
- October 15, 1986
- Helena's consciousness returns to her 16 year old self, multiple times, attempting to rewrite history.
- 1991
- November
- November 4, 1991
- Barry and Julia's daughter Megan born.
- 2003
- July
- July 11, 2003
- Date of Ann Voss Peters' false husband Joe Behrman's first wife Frannie's suicide attempt.
- 2007
- October
- October 22, 2007
- Eager to hear back from Mountainside capital regarding her scientific proposal, Helena is approached by a representative of billionaire Marcus Slade. In revised timeline, Helena returns to her Stanford lab, where she is once again approached by Marcus Slade's representative. This time though, shortly after accepting the offer, she goes into hiding.
- October 25, 2007
- Barry and Julia's daughter Megan dies, weeks shy of her 16th birthday. In Barry's new timeline, Barry prevents this tragedy.
- October 26, 2007
- Barry wakes up, still in the past, throws away a carton of Camel cigarettes and drinks coffee.
- November
- November 1, 2007
- Day 1 of Helena's research project on Marcus Slade's research facility, Fawkes Station.
- 2008
- January
- January 18, 2008
- Day 79 of Helena's research project on Marcus Slade's research facility. Her research project now in full swing, Helena cannot believe this is her life.
- June
- June 12, 2008
- Day 225 of Helena's research project on Marcus Slade's research facility. Helena is frustrated over a delay in her project due to lack of computing power.
- July
- July 27, 2008
- Day 270 of Helena's research project on Marcus Slade's research facility. Progress has halted while they await the arrival of quantum processors.
- August
- August 28, 2008
- Day 302 of Helena's research project on Marcus Slade's research facility. The quantum processors arrive.
- September
- September 7, 2008
- Day 312 of Helena's research project on Marcus Slade's research facility. Progress has resumed - the new processors are up and running.
- October
- October 29, 2008
- Day 364 of Helena's research project on Marcus Slade's research facility. Helena sees her completed memory chair for first time in the testing bay. Human trials begin - with her.
- October 31, 2008
- Day 366 of Helena's research project on Marcus Slade's research facility. Helena recalls her favorite memory of her father in the memory chair, when he took her fly fishing.
- November
- November 4, 2008
- Day 370 of Helena's research project on Marcus Slade's research facility. Helena recalls her favorite memory of her father in the memory chair, when he took her fly fishing, over an over.
- December
- December 24, 2008
- Day 420 of Helena's research project on Marcus Slade's research facility. The team' first memory reactivation attempt on Helena's 2nd Christmas Eve on the rig.
- December 26, 2008
- Day 422 of Helena's research project on Marcus Slade's research facility. The team begins recording and cataloging autobiographical memories of everybody in the rig.
- December 28, 2008
- Day 424 of Helena's research project on Marcus Slade's research facility. Lenore recalls her memory of the Challenger disaster when she was 8 years old, watching a TV on a rolling stand in her dentist's waiting room.
- 2009
- January
- January 21, 2009
- Day 448 of Helena's research project on Marcus Slade's research facility. Rajesh recalls his memory of his father, where they sat and talked in front of dying campfire.
- January 25, 2009
- Day 452 of Helena's research project on Marcus Slade's research facility. Sergei recalls his memory of the time a motorcycle clipped the back of his car on a Moscow street.
- March
- March 14, 2009
- Day 500 of Helena's research project on Marcus Slade's research facility. Helena and Marcus argue over the timeline for publishing their results. Slade is disappointed with their progress to date.
- March 29, 2009
- Day 515 of Helena's research project on Marcus Slade's research facility. Helena'a alone with Slade and a skeleton crew on the rig after most of the staff resigned following Slade's new orders involving stopping people's hearts and using the deprivation tank.
- June
- June 20, 2009
- Day 598 of Helena's research project on Marcus Slade's research facility. Slade convinces Helena to stay on the rig and continue with her research now that the deprivation tank is ready. He promises a day for the record books. Alternately, Slade's experiment creates a new memory of the same day.
- July
- July 5, 2009
- Day 613 of Helena's research project on Marcus Slade's research facility. Test subject Reed dies during experiment. Marcus Slade travels back to an earlier memory and saves him.
- July 6, 2009
- Day 614 of Helena's research project on Marcus Slade's research facility. Helena kills herself in the depravation tank, allowing her to return to the past, to her Stanford lab on October 22, 2007.
- 2018
- November
- November 2, 2018
- Barry meets Ann Voss Peters at the Poe building, where he is unable to prevent her from committing suicide. / An accident in Helena's lab sends John Jordan's consciousness back into a memory.
- November 4, 2018
- Barry meets his ex-wife Julia for brunch at a cafe to remember their deceased daughter Megan on her birthday. In new timeline, Barry has brunch with both Julia and Megan on her 26th birthday. Eventually, Barry, after transferring his consciousness back to a dead memory per Marcus Slade's instructions, returns to the original timeline, where he has brunch with Julia on Megan's birthday.
- November 5, 2018
- After paying Ann Voss Peters' false husband Joe Behrman a visit, Barry seeks out a mysterious hotel where he is drugged and abducted before being sent back into the past. Marcus Slade kills Helena in the original timeline. He then sneaks into the lab, reloads one of his memories into the stimulators and travels back in time, creating a new timeline. Eventually, Barry, after learning from Marcus Slade how to prevent dead memories from coming back, returns to the original timeline and prevents Marcus Slade from murdering Helena in the first place. Barry then seeks out Helena at a bar called Monk's Kettle.
- November 6, 2018
- Barry finds himself locked in a deprivation tank, forced to experience the last memories of his daughter Megan's life. In new timeline, Barry and Helena discuss plans to destroy Marcus Slade's memory chair.
- November 7, 2018
- Barry and Helena break into Marcus Slade's lab in order to destroy his memory chair. Multiple timelines ensue.
- November 15, 2018
- Day 8 of Helena being held captive by DARPA. Her former colleague demonstrates a powerful new use of the memory chair - sending a soldier back in time to prevent a school shooting in Maryland, saving the lives of 19 students.
- November 18, 2018
- Day 11 of Helena being held captive by DARPA. She attends a meeting that includes DARPA, a representative of the technology corporation Rand Systems as well as two military soldiers, with the goal of establishing a new time travel program capable of undoing human misery.
- November 24, 2018
- Day 17 of Helena being held captive by DARPA. The group becomes known as the Department of Undoing, and they establish official rules for using the memory chair, such as only going back three days into the past.
- December
- December 1, 2018
- Day 24 of Helena being held captive by DARPA. Steve kills the serial killer targeting children that group will discuss the following day.
- December 2, 2018
- Day 25 of Helena being held captive by DARPA. The group discusses using the memory chair to stop a serial killer targeting children.
- December 8, 2018
- Day 31 of Helena being held captive by DARPA. The group declines to intervene in a train derailment in Texas hill country that kills 9 people.
- December 31, 2018
- Day 54 of Helena being held captive by DARPA. The group declines to intervene in an airplane crash in the Evergreen Forest south of Seattle.
- 2019
- January
- January 4, 2019
- Day 58 of Helena being held captive by DARPA. Helena's restrictions are loosened, and she is allowed to walk the streets of New York at night, with chaperone. Timini sent back one day before the January 5 crash of a highly classified Boeing FA-XX fighter jet near the Ukraine border.
- January 5, 2019
- A highly classified Boeing FA-XX fighter jet malfunctions and goes down near the Ukraine border. The jet is confiscated and pilot captured.
- January 7, 2019
- Day 61 of Helena being held captive by DARPA. Timini stops an insurance salesman with a assault rifle from killing 28 students at a political demonstration on the Berkeley college campus.
- January 16, 2019
- Day 70 of Helena being held captive by DARPA. Steve prevents a suicide bomber from killing 12 people in the London Underground.
- February
- February 5, 2019
- Day 90 of Helena being held captive by DARPA. On the program's 3 month anniversary, the New York Times profiles their 8 missions so far, speculating about the existence of an enigmatic organization in possession of a technology beyond all understanding.
- February 14, 2019
- Helena Gray Smith dies in East Antarctica in the last recursive timeline before Barry transfers his consciousness back to a dead memory in the original timeline.
- March
- March 2, 2019
- Day 115 of Helena being held captive by DARPA. Helena receives a late night visit from DARPA agent John Shaw, informing her that soon other governmental agencies will know what they're doing.
- March 23, 2019
- Day 136 of Helena being held captive by DARPA. The group receives their first mandated assignment from the military - to travel back to January 4, 2019, the day before a highly classified Boeing FA-XX fighter jet malfunctioned and went down near the Ukraine border.
- March 27, 2019
- Day 140 of Helena being held captive by DARPA. While the group continues to intervene in civilian tragedies, their workload becomes increasingly more military facing, including undoing a drone strike that hit a wedding party on accident.
- April
- April 2, 2019
- Day 146 of Helena being held captive by DARPA. The group revises a U.S. military airstrike that hit the wrong target.
- April 8, 2019
- Day 152 of Helena being held captive by DARPA. The group resurrects 4 soldiers that died in an ambush. A new soldier is brought in to help Steve and Timini with the group's workload.
- April 16, 2019
- In one timeline, it's Day 160 of Helena being held captive by DARPA. Dead memories of multiple disasters surface, including a tunnel accident, a bridge explosion and a train station bombing. The Department of Undoing learns that the chair was leaked to private companies as well as governments almost a year earlier, and now others are using it to change the past. In several subsequent timelines, the world ends in nuclear war, despite Barry and Helen's attempts to rewrite history, trying and failing to find a way to prevent dead memories from harming the brain. Eventually, Barry learns from Marcus Slade how to stop it - going back into a dead memory from the original timeline.
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