[Wlug] vcalendar client program

I've been using KOrganizer from the kdepim package for a couple years now to store my appointments and todo lists, but I've recently been having issues with the timezone not being applied, causing all appointment times to be shifted into the future. The Configure Time & Date option does nothing at all, and the Configure KOrganizer dialog is an Empty Page (it literally says "Empty Page" on it!). Since I'd rather not be without my calendar for long, does anyone have any recommendations for a replacement program that can read the files made by KOrganizer? I gather that it uses a standard file format called "vcalendar".