Using PHP date function in Models

In my Model, I'm trying to associate 2 different things with a Course, using hasMany.  The idea is that there are 'Courseinstances', which are just sets of dates on which the Course runs, and 'Courseinstancesupcoming', which are future dates only.  I came up with the following (in Course.php):

public $hasMany = array(
'Courseinstance' => array(
'className'     => 'Courseinstance',
'foreignKey'    => 'course_id',
'order'     => 'datestart ASC'
),
'Courseinstanceupcoming' => array(
'className'     => 'Courseinstance',
'foreignKey'    => 'course_id',
'order'     => 'datestart ASC',
'conditions' => array(
'datestart > ' => date('Y-m-d H:i:s')
  )
)
);

Now, I'm not sure if this is a good thing to be even trying to do, but when I run it, I get the following error:

Error: syntax error, unexpected '(', expecting ',' or ';'
File: C:\wamp\www\RNNI\site\app\Model\Course.php

I tried various things, but got the same error.  Then I tried adding the following line:

var $date = date('Y-m-d H:i:s');

and this is now throwing an error instead (same error, but now on this line instead of the hasMany line).

If I do 

var $date = 'testing';

 

instead, it copes fine.  Is there something which prevents me from using the PHP date() function in a model in this way?

And if anyone can suggest a solution to the initial problem of having 2 types of objects in the hasMany, that'd also be good, but it's not so urgent, as I can work around that one.

Thanks in advance for any help!

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