When the US official time changes from PST to PDT, the viewer continues to display PST time. This is valid for the Clock of the viewer and for the time printed for IM and chat. To have the correct value, it needs to deconnect and connect again. Since a correct time is necessary to answer recent IM or to join events, it is the role of the server to send a message to all the viewers connected in the four corners of the world. One can suppose that the problem is the same when the time changes from PDT to PST Garmin