Saving datetime

How can i save an array like:

array(

'OnOff' => array(

'module_id' => '23',

'date_start' => array(

'month' => '07',

'day' => '28',

'year' => '2013',

'hour' => '01',

'min' => '40',

'meridian' => 'am'

),

'date_end' => array(

'month' => '07',

'day' => '28',

'year' => '2013',

'hour' => '01',

'min' => '40',

'meridian' => 'am'

),

'minutes_on' => '100',

'minutes_off' => '100'

)

)

Validation is:

public $validate = array(

        'date_start' => array(

            'rule' => array('datetime', 'mdy'),

            'required' => true,

            'allowEmpty' => false,

            'message' => 'Please enter a valid date and time.'

        ),

        'date_end' => array(

            'rule' => array('datetime', 'mdy'),

            'required' => true,

            'allowEmpty' => false,

            'message' => 'Please enter a valid date and time.'

        ),

        'minutes_on' => array(

            'rule' => 'numeric',

            'required' => true,

            'allowEmpty' => false,

            'message' => 'Numbers only'

        ),

        'minutes_off' => array(

            'rule' => 'numeric',

            'required' => true,

            'allowEmpty' => false,

            'message' => 'Numbers only'

        )

    );

And always fail with 'Please enter a valid date and time.'

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