On Aug 20, 2007, at 3:50 PM, Ronny wrote:

> I have installed ruby for Mac OS/X. Strangely, the classes Date and
> DateTime
> are not known:
>
> NameError: uninitialized constant DateTime
>         from (irb):1
>
> At least some other classes (I tried File and Time) exist, so it is
> not that the
> installation were completely broken.
>
> What could be the problem here?

did you do a

   require 'date'

before trying to access Date or DateTime.  They are not part of
the Core classes that are automatically defined when Ruby starts up.