Club Drupal

<?php

/**

 * @file

 * Date forms and form themes and validation.

 *

 * All code used in form editing and processing is in this file,

 * included only during form editing.

 */

/**

 * Private implementation of hook_widget().

 *

 * The widget builds out a complex date element in the following way:

 *

 * - A field is pulled out of the database which is comprised of one or

 *   more collections of start/end dates.

 *

 * - The dates in this field are all converted from the UTC values stored

 *   in the database back to the local time. This is done in #process

 *   to avoid making this change to dates that are not being processed,

 *   like those hidden with #access.

 *

 * - If values are empty, the field settings rules are used to determine

 *   if the default_values should be empty, now, the same, or use strtotime.

 *

 * - Each start/end combination is created using the date_combo element type

 *   defined by the date module. If the timezone is date-specific, a

 *   timezone selector is added to the first combo element.

 *

 * - The date combo element creates two individual date elements, one each

 *   for the start and end field, using the appropriate individual Date API

 *   date elements, like selects, textfields, or popups.

 *

 * - In the individual element validation, the data supplied by the user is

 *   used to update the individual date values.

 *

 * - In the combo date validation, the timezone is updated, if necessary,

 *   then the user input date values are used with that timezone to create

 *   date objects, which are used update combo date timezone and offset values.

 *

 * - In the field's submission processing, the new date values, which are in

 *   the local timezone, are converted back to their UTC values and stored.

 */

function date_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $base) {

  $element = $base;

  $field_name = $field['field_name'];

  $entity_type = $instance['entity_type'];

  // If this is a new entity, populate the field with the right default values.

  // This happens early so even fields later hidden with #access get those

  // values. We should only add default values to new entities, to avoid

  // over-writing a value that has already been set. This means we can't just

  // check to see if $items is empty, because it might have been set that way

  // on purpose. In date_field_widget_properties_alter() this is flagged if

  // this is a new entity. Check !isset($items[$delta]['value']) because entity

  // translation may create a new translation entity for an existing entity and

  // we don't want to clobber values that were already set in that case.

  // @see date_field_widget_properties_alter()

  // @see http://drupal.org/node/1478848.

  $is_default = FALSE;

  if (!isset($items[$delta]['value'])) {

    if (!empty($instance['widget']['is_new'])) {

      // New entity; use default values defined on instance.

      $items = date_default_value($field, $instance, $langcode);

      $is_default = TRUE;

    }

    else {

      // Date is empty; create array structure for value keys.

      $keys = date_process_values($field);

      $items[$delta] = array_fill_keys($keys, '');

    }

  }

  // @todo Repeating dates should probably be made into their own field type

  // and completely separated out. That will have to wait for a new branch

  // since it may break other things, including other modules that have an

  // expectation of what the date field types are. Since repeating dates cannot

  // use the default Add more button, we have to handle our own behaviors here.

  // Return only the first multiple value for repeating dates, then clean up

  // the 'Add more' bits in #after_build. The repeating values will be

  // re-generated when the repeat widget form is validated. At this point we

  // can't tell if this form element is going to be hidden by #access, and

  // we're going to lose all but the first value by doing this, so store the

  // original values in case we need to replace them later.

  if (!empty($field['settings']['repeat']) && module_exists('date_repeat_field')) {

    if ($delta == 0) {

      $form['#after_build'][] = 'date_repeat_after_build';

      $form_state['storage']['repeat_fields'][$field_name] = array_merge($form['#parents'], array($field_name));

      $form_state['storage']['date_items'][$field_name][$langcode] = $items;

    }

    else {

      return;

    }

  }

  module_load_include('inc', 'date_api', 'date_api_elements');

  $timezone = date_get_timezone($field['settings']['tz_handling'], isset($items[$delta]['timezone']) ? $items[$delta]['timezone'] : date_default_timezone());

  // TODO see if there's a way to keep the timezone element from ever being

  // nested as array('timezone' => 'timezone' => value)). After struggling

  // with this a while, I can find no way to get it displayed in the form

  // correctly and get it to use the timezone element without ending up

  // with nesting.

  if (is_array($timezone)) {

    $timezone = $timezone['timezone'];

  }

  $element += array(

    '#type' => 'date_combo',

    '#theme_wrappers' => array('date_combo'),

    '#weight' => $delta,

    '#default_value' => isset($items[$delta]) ? $items[$delta] : array(),

    '#date_timezone' => $timezone,

    '#element_validate' => array('date_combo_validate'),

    '#date_is_default' => $is_default,

    // Store the original values, for use with disabled and hidden fields.

    '#date_items' => isset($items[$delta]) ? $items[$delta] : array(),

  );

  $element['#title'] = $instance['label'];

  if ($field['settings']['tz_handling'] == 'date') {

    $element['timezone'] = array(

      '#type' => 'date_timezone',

      '#theme_wrappers' => array('date_timezone'),

      '#delta' => $delta,

      '#default_value' => $timezone,

      '#weight' => $instance['widget']['weight'] + 1,

      '#attributes' => array('class' => array('date-no-float')),

      '#date_label_position' => $instance['widget']['settings']['label_position'],

    );

  }

  // Make changes if instance is set to be rendered as a regular field.

  if (!empty($instance['widget']['settings']['no_fieldset'])) {

    $element['#title'] = check_plain($instance['label']);

    $element['#theme_wrappers'] = ($field['cardinality'] == 1) ? array('date_form_element') : array();

  }

  return $element;

}

/**

 * Create local date object.

 *

 * Create a date object set to local time from the field and widget settings and

 * item values. Default values for new entities are set by the default value

 * callback, so don't need to be accounted for here.

 */

function date_local_date($item, $timezone, $field, $instance, $part = 'value') {

  $value = $item[$part];

  // If the value is empty, don't try to create a date object because it will

  // end up being the current day.

  if (empty($value)) {

    return NULL;

  }

  // @todo Figure out how to replace date_fuzzy_datetime() function.

  // Special case for ISO dates to create a valid date object for formatting.

  // Is this still needed?

  // @codingStandardsIgnoreStart

  /*

  if ($field['type'] == DATE_ISO) {

    $value = date_fuzzy_datetime($value);

  }

  else {

    $db_timezone = date_get_timezone_db($field['settings']['tz_handling']);

    $value = date_convert($value, $field['type'], DATE_DATETIME, $db_timezone);

  }

  */

  // @codingStandardsIgnoreEnd

  $date = new DateObject($value, date_get_timezone_db($field['settings']['tz_handling']));

  $date->limitGranularity($field['settings']['granularity']);

  if (empty($date)) {

    return NULL;

  }

  date_timezone_set($date, timezone_open($timezone));

  return $date;

}

/**

 * The callback for setting a default value for an empty date field.

 */

function date_default_value($field, $instance, $langcode) {

  $item = array();

  $db_format = date_type_format($field['type']);

  $date = date_default_value_part($item, $field, $instance, $langcode, 'value');

  $item[0]['value'] = is_object($date) ? date_format($date, $db_format) : '';

  if (!empty($field['settings']['todate'])) {

    $date = date_default_value_part($item, $field, $instance, $langcode, 'value2');

    $item[0]['value2'] = is_object($date) ? date_format($date, $db_format) : '';

  }

  // Make sure the default value has the same construct as a loaded field value

  // to avoid errors if the default value is used on a hidden element.

  $item[0]['timezone'] = date_get_timezone($field['settings']['tz_handling']);

  $item[0]['timezone_db'] = date_get_timezone_db($field['settings']['tz_handling']);

  $item[0]['date_type'] = $field['type'];

  if (!isset($item[0]['value2'])) {

    $item[0]['value2'] = $item[0]['value'];

  }

  return $item;

}

/**

 * Default value callback to set either 'value', 'value2' to its default value.

 */

function date_default_value_part($item, $field, $instance, $langcode, $part = 'value') {

  $timezone = date_get_timezone($field['settings']['tz_handling']);

  $timezone_db = date_get_timezone_db($field['settings']['tz_handling']);

  $date = NULL;

  if ($part == 'value') {

    $default_value = $instance['settings']['default_value'];

    $default_value_code = $instance['settings']['default_value_code'];

  }

  else {

    $default_value = $instance['settings']['default_value2'];

    $default_value_code = $instance['settings']['default_value_code2'];

  }

  if (empty($default_value) || $default_value == 'blank') {

    return NULL;

  }

  elseif ($default_value == 'strtotime' && !empty($default_value_code)) {

    $date = new DateObject($default_value_code, date_default_timezone());

  }

  elseif ($part == 'value2' && $default_value == 'same') {

    if ($instance['settings']['default_value'] == 'blank' || empty($item[0]['value'])) {

      return NULL;

    }

    else {

      // The date stored in 'value' has already been switched to the db

      // timezone.

      $date = new DateObject($item[0]['value'], $timezone_db, DATE_FORMAT_DATETIME);

    }

  }

  // Special case for 'now' when using dates with no timezone, make sure 'now'

  // isn't adjusted to UTC value of 'now'.

  elseif ($field['settings']['tz_handling'] == 'none') {

    $date = date_now();

  }

  else {

    $date = date_now($timezone);

  }

  // The default value needs to be in the database timezone.

  date_timezone_set($date, timezone_open($timezone_db));

  $date->limitGranularity($field['settings']['granularity']);

  return $date;

}

/**

 * Process an individual date element.

 */

function date_combo_element_process($element, &$form_state, $form) {

  if (date_hidden_element($element)) {

    // A hidden value for a new entity that had its end date set to blank

    // will not get processed later to populate the end date, so set it here.

    if (isset($element['#value']['value2']) && empty($element['#value']['value2'])) {

      $element['#value']['value2'] = $element['#value']['value'];

    }

    return $element;

  }

  $field_name = $element['#field_name'];

  $delta = $element['#delta'];

  $bundle = $element['#bundle'];

  $entity_type = $element['#entity_type'];

  $langcode = $element['#language'];

  $date_is_default = $element['#date_is_default'];

  $field = field_widget_field($element, $form_state);

  $instance = field_widget_instance($element, $form_state);

  // Figure out how many items are in the form, including new ones added by

  // ajax.

  $field_state = field_form_get_state($element['#field_parents'], $field_name, $element['#language'], $form_state);

  $items_count = $field_state['items_count'];

  $columns = $element['#columns'];

  if (isset($columns['rrule'])) {

    unset($columns['rrule']);

  }

  $from_field = 'value';

  $to_field = 'value2';

  $tz_field = 'timezone';

  $offset_field = 'offset';

  $offset_field2 = 'offset2';

  // Convert UTC dates to their local values in DATETIME format, and adjust the

  // default values as specified in the field settings. It would seem to make

  // sense to do this conversion when the data is loaded instead of when the

  // form is created, but the loaded field data is cached and we can't cache

  // dates that have been converted to the timezone of an individual user, so

  // we cache the UTC values instead and do our conversion to local dates in

  // the form and in the formatters.

  $process = date_process_values($field, $instance);

  foreach ($process as $processed) {

    if (!isset($element['#default_value'][$processed])) {

      if (empty($element['#default_value']) || !is_array($element['#default_value'])) {

        $element['#default_value'] = array();

      }

      $element['#default_value'][$processed] = '';

    }

    $date = date_local_date($element['#default_value'], $element['#date_timezone'], $field, $instance, $processed);

    $element['#default_value'][$processed] = is_object($date) ? date_format($date, DATE_FORMAT_DATETIME) : '';

  }

  // Blank out the end date for optional end dates that match the start date,

  // except when this is a new node that has default values that should be

  // honored.

  if (!$date_is_default && $field['settings']['todate'] != 'required'

      && is_array($element['#default_value'])

      && !empty($element['#default_value'][$to_field])

      && $element['#default_value'][$to_field] == $element['#default_value'][$from_field]) {

    unset($element['#default_value'][$to_field]);

  }

  $show_todate = !empty($form_state['values']['show_todate']) || !empty($element['#default_value'][$to_field]) || $field['settings']['todate'] == 'required';

  $element['show_todate'] = array(

    '#title' => t('Show End Date'),

    '#type' => 'checkbox',

    '#default_value' => $show_todate,

    '#weight' => -20,

    '#access' => $field['settings']['todate'] == 'optional',

    '#prefix' => '<div class="date-float">',

    '#suffix' => '</div>',

  );

  $parents = $element['#parents'];

  $first_parent = array_shift($parents);

  $show_id = $first_parent . '[' . implode('][', $parents) . '][show_todate]';

  $element[$from_field] = array(

    '#field'         => $field,

    '#instance'      => $instance,

    '#weight'        => $instance['widget']['weight'],

    '#required'      => ($element['#required'] && $delta == 0) ? 1 : 0,

    '#default_value' => isset($element['#default_value'][$from_field]) ? $element['#default_value'][$from_field] : '',

    '#delta'         => $delta,

    '#date_timezone' => $element['#date_timezone'],

    '#date_format'      => date_limit_format(date_input_format($element, $field, $instance), $field['settings']['granularity']),

    '#date_text_parts'  => (array) $instance['widget']['settings']['text_parts'],

    '#date_increment'   => $instance['widget']['settings']['increment'],

    '#date_year_range'  => $instance['widget']['settings']['year_range'],

    '#date_label_position' => $instance['widget']['settings']['label_position'],

  );

  // Date repeat is a multiple value field. So the description is removed from

  // the single element earlier. Let's get it back.

  if (isset($element['show_repeat_settings']) && !empty($element['value']['#instance']['description'])) {

    $element['#description'] = $element['value']['#instance']['description'];

  }

  // Give this element the right type, using a Date API or a Date Popup element

  // type.

  $element[$from_field]['#attributes'] = array('class' => array('date-clear'));

  $element[$from_field]['#wrapper_attributes'] = array('class' => array());

  $element[$from_field]['#wrapper_attributes']['class'][] = 'date-no-float';

  switch ($instance['widget']['type']) {

    case 'date_select':

      $element[$from_field]['#type'] = 'date_select';

      $element[$from_field]['#theme_wrappers'] = array('date_select');

      $element['#attached']['js'][] = drupal_get_path('module', 'date') . '/date.js';

      $element[$from_field]['#ajax'] = !empty($element['#ajax']) ? $element['#ajax'] : FALSE;

      break;

    case 'date_popup':

      $element[$from_field]['#type'] = 'date_popup';

      $element[$from_field]['#theme_wrappers'] = array('date_popup');

      // Disable autocomplete in browsers.

      // @see https://developer.mozilla.org/en-US/docs/Web/Security/Securing_your_site/Turning_off_form_autocompletion

      $element[$from_field]['#attributes']['autocomplete'] = 'off';

      $element[$from_field]['#ajax'] = !empty($element['#ajax']) ? $element['#ajax'] : FALSE;

      break;

    default:

      $element[$from_field]['#type'] = 'date_text';

      $element[$from_field]['#theme_wrappers'] = array('date_text');

      $element[$from_field]['#ajax'] = !empty($element['#ajax']) ? $element['#ajax'] : FALSE;

  }

  // If this field uses the 'End', add matching element for the 'End' date, and

  // adapt titles to make it clear which is the 'Start' and which is the 'End' .

  if (!empty($field['settings']['todate'])) {

    $element[$to_field] = $element[$from_field];

    $element[$from_field]['#title_display'] = 'none';

    $element[$to_field]['#title'] = t('to:');

    $element[$from_field]['#wrapper_attributes']['class'][] = 'start-date-wrapper';

    $element[$to_field]['#wrapper_attributes']['class'][] = 'end-date-wrapper';

    $element[$to_field]['#default_value'] = isset($element['#default_value'][$to_field]) ? $element['#default_value'][$to_field] : '';

    $element[$to_field]['#required'] = ($element[$from_field]['#required'] && $field['settings']['todate'] == 'required');

    $element[$to_field]['#weight'] += .2;

    $element[$to_field]['#prefix'] = '';

    // Users with JS enabled will never see initially blank values for the end

    // date (see Drupal.date.EndDateHandler()), so hide the message for them.

    $element['#description'] .= '<span class="js-hide"> ' . t("Empty 'End date' values will use the 'Start date' values.") . '</span>';

    if ($field['settings']['todate'] == 'optional') {

      $element[$to_field]['#states'] = array(

        'visible' => array(

          'input[name="' . $show_id . '"]' => array(

            'checked' => TRUE,

          ),

        ),

      );

    }

  }

  // Create label for error messages that make sense in multiple values

  // and when the title field is left blank.

  if ($field['cardinality'] <> 1 && empty($field['settings']['repeat'])) {

    $element[$from_field]['#date_title'] = t('@field_name Start date value #@delta', array('@field_name' => $instance['label'], '@delta' => $delta + 1));

    if (!empty($field['settings']['todate'])) {

      $element[$to_field]['#date_title'] = t('@field_name End date value #@delta', array('@field_name' => $instance['label'], '@delta' => $delta + 1));

    }

  }

  elseif (!empty($field['settings']['todate'])) {

    $element[$from_field]['#date_title'] = t('@field_name Start date', array('@field_name' => $instance['label']));

    $element[$to_field]['#date_title'] = t('@field_name End date', array('@field_name' => $instance['label']));

  }

  else {

    $element[$from_field]['#date_title'] = t('@field_name', array('@field_name' => $instance['label']));

  }

  // Make changes if instance is set to be rendered as a regular field.

  if (!empty($instance['widget']['settings']['no_fieldset'])) {

    unset($element[$from_field]['#description']);

    if (!empty($field['settings']['todate']) && isset($element['#description'])) {

      $element['#description'] .= '<span class="js-hide"> ' . t("Empty 'End date' values will use the 'Start date' values.") . '</span>';

    }

  }

  $context = array(

    'field' => $field,

    'instance' => $instance,

    'form' => $form,

  );

  drupal_alter('date_combo_process', $element, $form_state, $context);

  return $element;

}

/**

 * Empty a date element.

 */

function date_element_empty($element, &$form_state) {

  $item = array();

  $item['value'] = NULL;

  $item['value2'] = NULL;

  $item['timezone'] = NULL;

  $item['offset'] = NULL;

  $item['offset2'] = NULL;

  $item['rrule'] = NULL;

  form_set_value($element, $item, $form_state);

  return $item;

}

/**

 * Validate and update a combo element.

 *

 * Don't try this if there were errors before reaching this point.

 */

function date_combo_validate($element, &$form_state) {

  // Disabled and hidden elements won't have any input and don't need

  // validation, we just need to re-save the original values, from before they

  // were processed into widget arrays and timezone-adjusted.

  if (date_hidden_element($element) || !empty($element['#disabled'])) {

    form_set_value($element, $element['#date_items'], $form_state);

    return;

  }

  $field_name = $element['#field_name'];

  $delta = $element['#delta'];

  $langcode = $element['#language'];

  // Related issue: https://drupal.org/node/2279831.

  if (!is_array($element['#field_parents'])) {

    $element['#field_parents'] = array();

  }

  $form_values = drupal_array_get_nested_value($form_state['values'], $element['#field_parents']);

  $form_input = drupal_array_get_nested_value($form_state['input'], $element['#field_parents']);

  // Programmatically calling drupal_submit_form() does not always add the date

  // combo to $form_state['input'].

  if (empty($form_input[$field_name]) && !empty($form_values[$field_name])) {

    form_set_value($element, $element['#date_items'], $form_state);

    return;

  }

  // If the whole field is empty and that's OK, stop now.

  if (empty($form_input[$field_name]) && !$element['#required']) {

    return;

  }

  $item = drupal_array_get_nested_value($form_state['values'], $element['#parents']);

  $posted = drupal_array_get_nested_value($form_state['input'], $element['#parents']);

  $field = field_widget_field($element, $form_state);

  $instance = field_widget_instance($element, $form_state);

  $context = array(

    'field' => $field,

    'instance' => $instance,

    'item' => $item,

  );

  drupal_alter('date_combo_pre_validate', $element, $form_state, $context);

  $from_field = 'value';

  $to_field = 'value2';

  $tz_field = 'timezone';

  $offset_field = 'offset';

  $offset_field2 = 'offset2';

  // Check for empty 'Start date', which could either be an empty value or an

  // array of empty values, depending on the widget.

  $empty = TRUE;

  if (!empty($item[$from_field])) {

    if (!is_array($item[$from_field])) {

      $empty = FALSE;

    }

    else {

      foreach ($item[$from_field] as $key => $value) {

        if (!empty($value)) {

          $empty = FALSE;

          break;

        }

      }

    }

  }

  // An 'End' date without a 'Start' date is a validation error.

  if ($empty && !empty($item[$to_field])) {

    if (!is_array($item[$to_field])) {

      form_error($element, t("A 'Start date' date is required if an 'end date' is supplied for field %field #%delta.", array('%delta' => $field['cardinality'] ? intval($delta + 1) : '', '%field' => $instance['label'])));

      $empty = FALSE;

    }

    else {

      foreach ($item[$to_field] as $key => $value) {

        if (!empty($value)) {

          form_error($element, t("A 'Start date' date is required if an 'End date' is supplied for field %field #%delta.", array('%delta' => $field['cardinality'] ? intval($delta + 1) : '', '%field' => $instance['label'])));

          $empty = FALSE;

          break;

        }

      }

    }

  }

  // If the user chose the option to not show the end date, just swap in the

  // start date as that value so the start and end dates are the same.

  if ($field['settings']['todate'] == 'optional' && empty($item['show_todate'])) {

    $item[$to_field] = $item[$from_field];

    $posted[$to_field] = $posted[$from_field];

  }

  if ($empty) {

    $item = date_element_empty($element, $form_state);

    if (!$element['#required']) {

      return;

    }

  }

  else {

    $timezone = !empty($item[$tz_field]) ? $item[$tz_field] : $element['#date_timezone'];

    $timezone_db = date_get_timezone_db($field['settings']['tz_handling']);

    $element[$from_field]['#date_timezone'] = $timezone;

    $from_date = date_input_date($field, $instance, $element[$from_field], $posted[$from_field]);

    if (!empty($field['settings']['todate'])) {

      $element[$to_field]['#date_timezone'] = $timezone;

      $to_date = date_input_date($field, $instance, $element[$to_field], $posted[$to_field]);

    }

    else {

      $to_date = $from_date;

    }

    // Neither the start date nor the end date should be empty at this point

    // unless they held values that couldn't be evaluated.

    if (!$instance['required'] && (!date_is_date($from_date) || !date_is_date($to_date))) {

      $item = date_element_empty($element, $form_state);

      $errors[] = t('The dates are invalid.');

    }

    elseif (!empty($field['settings']['todate']) && $from_date > $to_date) {

      form_set_value($element[$to_field], $to_date, $form_state);

      $errors[] = t('The End date must be greater than the Start date.');

    }

    else {

      // Convert input dates back to their UTC values and re-format to ISO or

      // UNIX instead of the DATETIME format used in element processing.

      $item[$tz_field] = $timezone;

      // Update the context for changes in the $item, and allow other modules to

      // alter the computed local dates.

      $context['item'] = $item;

      // We can only pass two additional values to drupal_alter, so $element

      // needs to be included in $context.

      $context['element'] = $element;

      // Trigger hook_date_combo_validate_date_start_alter().

      drupal_alter('date_combo_validate_date_start', $from_date, $form_state, $context);

      // Trigger hook_date_combo_validate_date_end_alter().

      drupal_alter('date_combo_validate_date_end', $to_date, $form_state, $context);

      $item[$offset_field] = date_offset_get($from_date);

      $test_from = date_format($from_date, 'r');

      $test_to = date_format($to_date, 'r');

      $item[$offset_field2] = date_offset_get($to_date);

      date_timezone_set($from_date, timezone_open($timezone_db));

      date_timezone_set($to_date, timezone_open($timezone_db));

      $item[$from_field] = date_format($from_date, date_type_format($field['type']));

      $item[$to_field] = date_format($to_date, date_type_format($field['type']));

      if (isset($form_values[$field_name]['rrule'])) {

        $item['rrule'] = $form_values[$field['field_name']]['rrule'];

      }

      // If the db timezone is not the same as the display timezone and we are

      // using a date with time granularity, test a roundtrip back to the

      // original timezone to catch invalid dates, like 2AM on the day that

      // spring daylight savings time begins in the US.

      $granularity = date_format_order($element[$from_field]['#date_format']);

      if ($timezone != $timezone_db && date_has_time($granularity)) {

        date_timezone_set($from_date, timezone_open($timezone));

        date_timezone_set($to_date, timezone_open($timezone));

        if ($test_from != date_format($from_date, 'r')) {

          $errors[] = t('The Start date is invalid.');

        }

        if ($test_to != date_format($to_date, 'r')) {

          $errors[] = t('The End date is invalid.');

        }

      }

      if (empty($errors)) {

        form_set_value($element, $item, $form_state);

      }

    }

  }

  // Don't show further errors if errors are already flagged because otherwise

  // we'll show errors on the nested elements more than once.

  if (!form_get_errors() && !empty($errors)) {

    if ($field['cardinality']) {

      form_error($element, t('There are errors in @field_name value #@delta:', array('@field_name' => $instance['label'], '@delta' => $delta + 1)) . theme('item_list', array('items' => $errors)));

    }

    else {

      form_error($element, t('There are errors in @field_name:', array('@field_name' => $instance['label'])) . theme('item_list', array('items' => $errors)));

    }

  }

}

/**

 * Determine the input format for this element.

 */

function date_input_format($element, $field, $instance) {

  if (!empty($instance['widget']['settings']['input_format_custom'])) {

    return $instance['widget']['settings']['input_format_custom'];

  }

  elseif (!empty($instance['widget']['settings']['input_format']) && $instance['widget']['settings']['input_format'] != 'site-wide') {

    return $instance['widget']['settings']['input_format'];

  }

  return variable_get('date_format_short', 'm/d/Y - H:i');

}

/**

 * Implements hook_date_select_pre_validate_alter().

 */

function date_date_select_pre_validate_alter(&$element, &$form_state, &$input) {

  date_empty_end_date($element, $form_state, $input);

}

/**

 * Implements hook_date_text_pre_validate_alter().

 */

function date_date_text_pre_validate_alter(&$element, &$form_state, &$input) {

  date_empty_end_date($element, $form_state, $input);

}

/**

 * Implements hook_date_popup_pre_validate_alter().

 */

function date_date_popup_pre_validate_alter(&$element, &$form_state, &$input) {

  date_empty_end_date($element, $form_state, $input);

}

/**

 * Helper function to clear out end date when not being used.

 */

function date_empty_end_date(&$element, &$form_state, &$input) {

  // If this is the end date and the option to show an end date has not been

  // selected, empty the end date to surpress validation errors and stop

  // further processing.

  $parents = $element['#parents'];

  $parent = array_pop($parents);

  if ($parent == 'value2') {

    $parent_values = drupal_array_get_nested_value($form_state['values'], $parents);

    if (isset($parent_values['show_todate']) && $parent_values['show_todate'] != 1) {

      $input = array();

      form_set_value($element, NULL, $form_state);

    }

  }

}