Some franchises produce a tangled timeline due to a gaggle of sequels, prequels, and side stories mingling with time travel, alternate realities, and cross-dimensional rifts.
Through three games, the storyline in Gearbox’s Borderlands franchise doesn’t do this. But the developer still felt the need to create an official timeline to map the major events of Borderlands, Borderlands 2, and Borderlands: The Pre-Sequel (which takes place between the first two games but is presented as a flashback from after Borderlands 2). With the official timeline in place, everyone will be on the same page ahead of the release of Tales From the Borderlands, which should launch before the end of the year.
You can find the timeline after the break, but beware, it contains quite a few spoilers from Borderlands: The Pre-Sequel.