I have this coded in my form:

  $form['created_before'] = array(
    '#title' => t('created 
before'),
    
'#type' => 'date',
    '#validate' => 'date_validate',
    '#submit' => 'cmf_date_submit',
    '#default_value' => array('year' => date('Y'), 
'month' => 12, 
'day' =>31),
    '#prefix' => '<div class="date-inline">',
    '#suffix' => '</div>',
    
);

The validate function is being called, but the submit function is not. Yes, there is a form submit button.

Why is the submit function not being called?