The in-game boss timer notification only works properly for those living in the GMT+8 timezones, given that it works using the clientside system time. 

For newer/unacccustomed players, the time discrepancy between the boss notifications and the boss spawning is a source of frustration as the timer either appears too early or too late.

And while online-boss timers do exist, it's an extra resource that has to be used to make up for the in-game notification not working properly for those living in other areas.

I may not know about the game's inner workings but fixing the in-game notifications seems like something easy to fix.

I already sent ticket to GM, answered by GM Keplan. He said they will evaluate the system. I hope they will fix this soon, because there is so many new player to BDO since the release of season server. We don't want them got confused don't we ?, Hey where's the boss !!@@

I've sent a ticket about this too! I hope they could fix it.