When I try to use column view in my org file (C-c C-x C-c), I get the
following error:

  Symbol's function definition is void: time-to-number-of-days

I looked at time-date.el and found the definition of time-to-number-of-days.
I noticed that many of the functions in time-date.el have the following
comment before the function is defined:

  ;;;###autoload

I am using emacs 23.1.1 on Windows XP.

Can anyone give me some help how to get this working.

Thanks,

Dave