New users will select their own timezone at registration. File core/modules/system/
system_retrieve_file($url, $destination = NULL, $managed = FALSE, $replace = FILE_EXISTS_RENAME) Attempts to
system_cron() Implements
system_user_login(UserInterface $account) Implements
system_admin_compact_mode() Determines whether the current user is in compact mode. Compact
system_theme_suggestions_region(array $variables) Implements
system_authorized_run($callback, $file, $arguments = array(), $page_title = NULL) Setup and invoke an operation
system_user_timezone(&$form, FormStateInterface $form_state) Add the time zone field to the user edit and
system_authorized_batch_process() Use authorize.php to run
_system_rebuild_module_data_ensure_required($module, &$modules) Ensures that dependencies of required modules
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