Apparently this is a result of a tweak from GN.
Horizons EU doesn't have the same files as NA (authserver/login related?)
now - we do get this major patch somewhere the next 2 weeks - until this the timer issues can reappear.
However - talked to Luca today and he said he recheck the clocks

So we shouldn't get anymore timer issues the next 2 weeks.
If still troubles, a relog solves it.
Technical Background for those who wanna know:
If all servers (as it should be) are timewise in synch - Hz-Server fails to start with the current version of loginwebsite/authserver. User accounts are spread over various computers - chance is your on a server with a date from 2004. I got this problem too, so does Soresha I believe - as well as lots of other players outside guild.
best,
Arcat