Wanted, a simple GUI calendar that uses local files, not evolution server dependent

[Chris Green]

I want a GUI calendar that I can use when off line, so that rules out
Google Calendar and anything else like that.  It *can* be web based
though because I run apache2 on my system.  However a simple GTK GUI
would be ideal.

I thought gnome-calendar was what I wanted but it uses the evolution
server which means that although it writes to local files it doesn't
write them directly which makes synchronising across two systems
almost impossible.

So is there anything out there with an interface like gnome-calendar
(or even like Google calendar) but which simply writes its data to
local files?  I have tried gnome-calendar without evolution data
server installed but it doesn't work at all, it's wholly dependent on
evolution even for its interface to other calendars (or so it seems
anyway, if anyone can show me otherwise I'd be pleased to know).

While Osmo and Orage write to local files their GUI interface is
rather clunky IMHO.

-- 
Chris Green