Timeline of Portal 1 & 2 (1943 - 52014)

Smash like and subscribe if you believe that the cake is real
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Music used:

Portal 2 OST Volume 1 - Concentration Enhancing Menu Initialiser

Portal 2 OST Volume 1 - 9999999

Portal 2 OST Volume 3 - Wheatley Science

Portal 2 OST Volume 3 - The Part Where He Kills You

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Timestamps (wowee experimental)

00:01 - 00:54 - Before Black Mesa

00:54 - 03:01 - Competition with Black Mesa

03:01 - 03:33 - After Cave Johnson

03:33 - 04:02 - Rise of GLaDOS

04:02 - 07:20 - Black Mesa Incident

07:20 - 08:40 - Combine Occupation

08:40 - 10:05 - Far Future

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Sources

https://half-life.fandom.com/wiki/Tim...

https://combineoverwiki.net/wiki/Time...