function system_time_zones in Drupal 7

Same name and namespace in other branches

1. 8 core/modules/system/system.module \system_time_zones()
2. 9 core/modules/system/system.module \system_time_zones()
3. 10 core/modules/system/system.module \system_time_zones()

Generate an array of time zones and their local time&date.

Parameters

$blank: If evaluates true, prepend an empty time zone option to the array.

5 calls to system_time_zones()

system_regional_settings in modules/system/system.admin.inc

Form builder; Configure the site regional settings.

system_update_7013 in modules/system/system.install

Convert default time zone offset to default time zone name.

system_user_timezone in modules/system/system.module

Add the time zone field to the user edit and register forms.

user_update_7002 in modules/user/user.install

Convert user time zones from time zone offsets to time zone names.

_install_configure_form in includes/install.core.inc

Form constructor for a site configuration form.

File

modules/system/system.module, line 3400

Configuration system that lets administrators modify the workings of the site.

Code

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: @date', array(
        '@zone' => t(str_replace('_', ' ', $zone)),
        '@date' => format_date(REQUEST_TIME, 'custom', variable_get('date_format_long', 'l, F j, Y - H:i') . ' O', $zone),
      ));
    }
  }

  // Sort the translated time zones alphabetically.
  asort($zones);
  return $zones;
}