system_time_zones

system_time_zones($blank = NULL)

function system_time_zones($blank = NULL) {
  $zonelist = timezone_identifiers_list();
  $zones = $blank ? array('' => t('- None selected -')) : array();
  foreach ($zonelist as $zone) {
    // Because many time zones exist in PHP only for backward compatibility
    // reasons and should not be used, the list is filtered by a regular
    // expression.
    if (preg_match('!^((Africa|America|Antarctica|Arctic|Asia|Atlantic|Australia|Europe|Indian|Pacific)/|UTC$)!', $zone)) {
      $zones[$zone] = t('@zone', array('@zone' => t(str_replace('_', ' ', $zone))));
    }
  }
  // Sort the translated time zones alphabetically.
  asort($zones);
  return $zones;
}