This article contains heavy spoilers from the Webtoon. The most updated information about Tower of God from the latest chapters can be found here. If you haven't caught up with the Webtoon, read at your own risk.
This page chronicles the timeline of all the events that have occurred in the webtoon. The reference timeline is 0, when Baam entered the Tower. The time before this will be notated with BB (before Baam) and after will be AB (after Baam).
Volume refers to Seasons in the webtoon, to prevent confusion with anime seasons.
Unknown time later: Baam and friends takes the Administrator's test.
Ren attempts to kill Anak but is stopped by Yuri's team. Yuri reclaims the Black March and takes away the Green April.
Rachel pushes Baam before the end of the test; Baam is declared dead. Hwa Ryun is assigned as Baam's Guide. Yu Han Sung threatens to kill Baam's friends. Baam begins training with FUG under Ha Jinsung.
Lero-Ro and Quant leave their jobs. Khun, suspecting something, climbs the Tower with Rachel, while most of the rest form a team with Shibisu.