Timeline(s)
With the retelling of Arrivederci Yamato as the open-ended Yamato II television series (ending in late 2201), Arrivederci Yamato was redesignated as a discardable, alternate timeline. The follow-on film, Yamato: New Journey, took place in late 2201; and its successor, Be Forever Yamato, in early 2202. Yamato III was commonly believed to be set in 2205 (several printed publications used this date, although it was never stated in the show's broadcast). But the following film, Final Yamato, was set in 2203. The opening narration of Final mentioned the Bolar/Galman conflict, implying that the date for Yamato III was to be regarded as some time between 2202 and 2203 (making for an unrealistic and compressed timeline).
It is not known if this change was due to the lackluster response to Yamato III, the production staff's dissatisfaction with the truncated series (additionally, Nishizaki and Matsumoto had limited involvement with it), or a mere oversight.
In 2220, the ship is rebuilt following the events of Final Yamato. The new captain of the ship is Susumu Kodai, who was the main character in the previous movies. This is canon, as it is set 17 years after Final Yamato. It is not known what happened between 2203 and 2220.
Read more about this topic: Space Battleship Yamato