Timeline

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Portal:Access All Areas is set in the Half-Life universe, the timeline of which cannot be completed, as the mod has not been released yet.

1950s

 * 1953 - Aperture Science is founded as a shower curtain manufacturer.

1960s

 * 1957 to 1976 - Aperture Science produces mostly shower curtains.

1970s

 * 1979 - Cave Johnson, after being poisoned in mercury in 1978, lays out his 3-tier program:
 * Tier 1 - Heimlich Counter-Maneuver
 * Tier 2 - Take-A-Wish Foundation
 * Tier 3 - At the time unknown, turned out to be the Aperture Science Handheld Portal Device

1980s

 * 1981 to 1985 - "Portal" project continues.
 * 1986 - Aperture discovers Black Mesa is working on portals (really teleports), and starts building GLaDOS.

1990s

 * 1998 - GLaDOS is activated for the first annual bring-your-daughter-to-work-day.
 * 1998, cont. - Half-Life events occur.

2010s

 * Somewhere around this decade - Seven Hour War happens. The Combine take over Earth.
 * c. 2018 - Half-Life 2, Half-Life 2: Episode Two and Portal events occur.
 * c. 2018, cont. - P:AAA is set to happen at this date, and is planned to use Chell after Portal 2. This indicates some form of time travel.

22nd century

 * c. 2118 - Portal 2 events occur.