Hello, I have the latest thunderbird (128.5.1esr (64-bit)), running on Windows 11 and connected to a mailcow server. I am having problems with creating calendar events - they are created 1 hour in the future. They show up fine in thunderbird, but Mailcow/SOGo and mobile phones, etc all show the incorrect time. If I create an event outside thunderbird, or edit it outside thunderbird, all is ok. I have opened the error console, and it gives me a number of warnings "Calendar: Could not find definition for W. Australia Standard Time" I am not sure where it is looking for this - but that is the timezone my computer is set to, it exists in the registry, etc. There is an attached screenshot with more details of the error - maybe its java library issue or something? Regards, Mal.