I'm searching the option to change the Time Zone in wl.com but cannot find it.
TZ is not an editable field on wl.com. What sort of stations are you running? Assuming it's a logger-based one (ie and not Connect or EM) then you could try editing the console TZ settings. That's obviously normally done before connecting to a wl.com account, so not sure how quickly it might get picked up by wl.com, but try this and see if it worls.
Thanks for the answer. As far as I see, wl.com runs the database civil time oriented (this is in Spain UTC + 1 althought the same Meridian as the UK), independently from the time the console is adjusted. But if the console is restarted, and some times without that, the time on the console changes to the civil time. It is a Vantage Vue with weatherlink IP. This behaviour is new to wl.com V2.0. I have run those stations (7 in total) for years with wl.com V1.0 in UTC time without problems, nor spontan clock changes, and with a database consistent to the official stations from the met office, with wich I collaborate. This seems not to be longer possible with wl.com V2.