Ghostbusters: Spirits Unleashed timeline
-Halloween decorations around.
-Act 2 is "weeks" after Act 1. (I think - I don't remember which part stated the new recruit was on the job for weeks)
-Act 6 is 9 days after Act 5.
As for it being canon, the new characters state it's a temporary job, so either they didn't move on to a prolonged contract or they started busting outside New York like Bryan Welsh/Rookie (from TVG) did after 1991. They state Phoebe will take over the firehouse one day too, so it's pretty easy for this to be canon with the upcoming film. I think everything from now on will be canon with the films anyway.
It's been a while since we've received an update on the upcoming Ghostbusters comic series from Dark Horse, but in today's news, stemming from a Screen Rant exclusive, fans have not only been given a new sneak peek, but also a full reveal of the talented team behind the miniseries, and the...
1994 - San Francisco Ghostbusters established
2024 - no ghosts have been seen in San Francisco for decades.
Ray Stantz has a cameo at the end of the game, so Ghostbusters: Rise of the Ghost Lord seems to be safely part of Afterlife canon, which means that the last ghost sighting was definitely not 30 years prior to Afterlife because the San Francisco Ghostbusters were established 27 years before it.