Feel free to make the necessary changes to the Roundcube core in order to have a proper timezone support. You will, however, face some difficulties when one uses "automatic" setting and the timezone has to be taken from the client browser. There we only have very limited means of reading the actual timezone settings.
Here is my patch. Maybe it is a little bit overdone, but I tried to implement backwards compatibility.
You can test it live @ http://svn.mail4us.net
Regards, Roland
--- 8< --- detachments --- 8< --- The following attachments have been detached and are available for viewing. http://detached.gigo.com/rc/u3/RxeaVfWs/timezone.diff Only click these links if you trust the sender, as well as this message. --- 8< --- detachments --- 8< ---
List info: http://lists.roundcube.net/dev/ BT/aba52c80