@view_config(renderer='templates/form.pt', name='datetimeinput')
    @demonstrate('DateTime Input Widget')
    def datetimeinput(self):
        import datetime
        from colander import Range
        class Schema(colander.Schema):
            date_time = colander.SchemaNode(
                colander.DateTime(),
                validator=Range(
                    min=datetime.datetime(
                        2010, 5, 5, 12, 30, tzinfo=iso8601.Utc()),
                    min_err=_('${val} is earlier than earliest datetime ${min}')
                    )
                )
        schema = Schema()
        form = deform.Form(schema, buttons=('submit',))
        when = datetime.datetime(2010, 5, 6, 12)
        return self.render_form(form, appstruct={'date_time':when})