- 1930
- 1944
- 1947
- 1949
- 1968
- 1969
- October
- October 9
- Frequency 2000 Film | Source Timeline
 - Fireman Frank Sullivan has a close call fighting a fire. During the opening fire scene, a radio announcer mentions tomorrow's opening game of the 1969 World Series, which takes place on October 11, 1969. However, the title card declaring October 10, 1969 doesn't come up until the following day. In the same announcement, it is revealed that sanitation workers discovered the dead body of a third strangled nurse in a dumpster in Queens - now referred to as the Nightingale Murders.
- October 11
- Frequency 2000 Film | Source Timeline
 - First game of the 1969 World Series. Frank Sullivan watches outside with his family, friends and neighbors. Later that night, he talks to his son thirty years in the future on his HAM radio, learning that he dies the next day in the Buxton Seeds warehouse fire.
- October 14
- Frequency 2000 Film | Source Timeline
 - In the original timeline, Nightingale victim Carrie Reynolds leaves Roosevelt Hospital at 6pm, showed up at Cozy's Bar around 6:30pm. She walked out of that bar around 7:30pm. They found her dead in an alley behind the bar at 8pm. Frank goes to the bar, changing history.
- 1970
- 1971
- 1976
- 1999
- October 11
- Frequency 2000 Film | Source Timeline
 - John Sullivan eats dinner with his mother at her apartment. Later that night, he talks to his father thirty years in the past, informing him that he's going to die the next day.
- October 13
- Frequency 2000 Film | Source Timeline
 - John visits his ex, but she doesn't recognize him after the timeline change. Later, he learns that his mother was a victim of the Nightingale murderer. He tells Frank that the next Nightingale murder in on October 14, 1969.
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