Changing the year range in the form's date element

I realise this might not be the best solution for this problem, but it's the only one I've been able to make work. It consists of tweaking the select element in case it's a year combobox. Since I want all years to range from the present to 2006, then it works for my entire site. Hope it helps.

function newsspace_select($element) {
	if($element['#parents'][1] == 'year'){
		$element['#options'] = range(date('Y'), 2006);
	}

  return theme_select($element);
}

The webform module adds a useful function for processing the date field, adding '#year_start' and '#year_end' elements to the date field. You can either put actual start and end years in these fields, or use + and - for offsets from the current year.

If you have this module active, you could call the webform function in your form creation as follows:

  $form['general']['dob'] = array(
    '#type' => 'date',
    '#title' => t('Date of Birth'),
    '#default_value' => "",
    '#required' => TRUE,
    '#year_start' => '-99',
    '#year_end' => '+0',
    '#after_build' => array('webform_expand_date'),
  );

If you don't have the Webform module on your site, I've copied a trimmed down version of the functions below (just change "my_module" to your module name):

/**
 * Form API #process function for Webform date fields.
 */
function my_module_pricing_expand_date($element) {
  // Convert relative dates to absolute ones.
  foreach (array('year_start', 'year_end') as $start_end) {
    $year = $element['#' . $start_end];
    if (strpos($year, '-') === 0 || strpos($year, '+') === 0) {
      $timezone = $component['extra']['timezone'] != 'user' ? NULL : 'user';
      $element['#' . $start_end] = my_module_pricing_strtodate('Y', $year . ' years', $timezone);
    }
  }

  // Tweak the year field.
  if (is_numeric($element['#year_start']) && is_numeric($element['#year_end'])) {
    $element['year']['#options'] = drupal_map_assoc(range($element['#year_start'], $element['#year_end']));
  }

  return $element;
}

function my_module_pricing_strtodate($format, $string, $timezone_name = NULL) {
  // Adjust the time based on the user or site timezone.
  // The "timezone_name" variable is provided by DateAPI in Drupal 6.
  if (variable_get('configurable_timezones', 1) && $timezone_name == 'user') {
    $timezone_name = isset($GLOBALS['user']->timezone_name) ? $GLOBALS['user']->timezone_name : NULL;
  }
  elseif (empty($timezone_name) || $timezone_name == 'user') {
    $timezone_name = variable_get('date_default_timezone_name', NULL);
  }

  if (!empty($timezone_name) && class_exists('DateTimeZone')) {
    $timezone = new DateTimeZone($timezone_name);
    $datetime = new DateTime($string, $timezone);
    return $datetime->format($format);
  }
  else {
    return date($format, strtotime($string));
  }
}

An example of its use is:

  $form['general']['dob'] = array(
    '#type' => 'date',
    '#title' => t('Date of Birth'),
    '#default_value' => "",
    '#required' => TRUE,
    '#year_start' => '-99',
    '#year_end' => '+0',
    '#after_build' => array('my_module_expand_date'),
  );

Hope this helps somebody.

James

A better way to do this:

  $form['booking-info']['return-date'] = array(
    '#type' => 'date_select',
    '#title' => t('Date & Time'),
    '#default_value' => date('d m Y')),
    '#required' => true,
    '#date_format' => 'd m Y H i',
    '#date_year_range' => '-0:+1',
  );

If use date_popup, changing year range:

  $form['add']['date'] = array(
    '#title' => t('date :'),
    '#type' => 'date_popup',
    '#date_year_range' => '-50:+0',
    '#date_format' => 'd-m-Y',
    '#required' => TRUE,
  );

Select first year, mouth and date.