Missing dependency to interval field

Here is the patch.

Thanks for the review.

Hello,

In our project, we use date_restrictions in a custom form, see the following code:

  $form['date'] = array(
    '#title' => t('Choose a date'),
    '#type' => 'date_popup',
    //'#flavour' => 'inline', // requires date_datepicker_inline module.
    '#date_format' => $date_format,
    '#default_value' => $date_default_value,
    '#restrictions' => array(
      'min' => array(
        'type' => 'date',
        'date' => $date_old_prev,
      ),
      'max' => array(
        'type' => 'interval',
        'interval' => array('interval' => $interval, 'period' => 'days'),
      ),
    ),
  );

Before the commit it worked well. Now we have the following error: Fatal error: Call to undefined function interval_apply_interval() in /sites/all/modules/contrib/date_restrictions/modules/minmax/date_restrictions_minmax.date_restrictions.inc on line 290

Thanks for pointing the dependencies check of the module but It seems not working in custom forms.

Maybe we do not use the module correctly, in this case I will be very thankful if you can tell me the problem or pointing me to the associated documentation.

Thanks for your response.

Ok I will provide a patch for this advice.

Here is a patch that adds the information in the README.txt

Thanks for the review.