Day 1: 12:00am-1:00am

=== Production ===
* This is the pilot episode of ''[[24]]''. The script, written by [[Joel Surnow]] and [[Robert Cochran]], was completed in {{d|October|?|2000}}, and the pilot was picked up by Fox in {{d|January|?|2001}}. Filming took place in April {{y|2001}}. Originally, the plan was to film in Toronto or Vancouver, but if the series were picked up, the seasonal changes over the course of production would make it impossible to keep a consistent look throughout the season, and instead Los Angeles was chosen.
[[File:Flight 221 explode.jpg|thumb|right|200px|Flight 221 explosion, cut from the final episode]]
* ''[[24]]'' was scheduled to premiere on {{d|October|30|2001}} but the episode, which depicted the destruction of a passenger flight, was delayed in light of the September 11 attacks, finally airing on {{d|November|6|2001}}. A shot actually showing the plane explosion, seen in promotional ads for the show, was cut from the final episode.
* Many aspects of the now-iconic logo and digital clock differ from later episodes. The intro sound effects feature a gunshot when the ''24'' logo finally comes into focus. The digital clock tone is noticeably different, and many of the periodic mid-scene clocks have their own ticking sound instead of being silent. In addition, in the final split screen, a camera snapshot sound effect accompanies the appearance of each pane, instead of the "boom" sound effect used in later episodes.
* This and "[[Day 1: 11:00pm-12:00am]]" are the only two episodes of the series to substitute the word "midnight" for "12:00 A.M." during the opening "The following takes place..." narration.
[[File:Clock.jpg|thumb|right|200px|Emphasis was placed on clocks throughout the episode]]
* As this is the pilot episode, heavy attention was paid to the "real time" aspect of the show, which at the time was the show's biggest, most original selling point.  This can be seen throughout the episode, with several shots containing clocks, and several lines of dialogue referring directly to the time.  As the show progressed, the focus switched more towards dramatic story telling, and less on the fact that each episode was in "real time." 
*The footage of a passing satellite was taken from the 1998 movie ''Enemy of the State'', which starred [[Jon Voight]] and [[Carlos Gomez]].
*Meanwhile, the footage of the helicopter passing over downtown Los Angeles was taken from the 1995 movie ''Heat, ''which also starred Jon Voight, in addition to [[Dennis Haysbert]].
*'''International airdates:'''
**UK: {{d|March|3|2002}} on BBC2