Table: Employee
| id | name  | position     |
|  1 | Ned   | kitchen      |
|  2 | Bob   | server       |
|  3 | Jon   | server       |

Table: Tips
| id | employee | date       | amount
|  1 |        1 | 2012-11-12 | 9.00
|  2 |        2 | 2012-11-14 | 4.55
|  3 |        1 | 2012-11-15 | 8.01
|  4 |        2 | 2012-11-15 | 2.00
|  5 |        1 | 2012-11-23 | 3.02

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Example code
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$sdate = '2012-11-01';
$edate = '2012-11-31';
$entries = Model_Employee::find('all', array(
			'related' => array(
				'tips' => array(
					'join_type' => 'left',
					'where' => array(
						array('date', '>=', $sdate),
						array('date', '<=', $edate),
					),
				),
			)
		));

------------------------------------

Expected result:

Ned
 position => kitchen
 tips =>
	9.00
	8.01
	3.02
Bob
 position => server
 tips =>
	4.55
	2.00
Jon
 position => server
 tips =>

 ------------------------------------

 Actual result:

 Ned
 position => kitchen
 tips =>
	9.00
	8.01
	3.02
Bob
 position => server
 tips =>
	4.55
	2.00