Cron run every which is set the time.

 /**

 * Implements hook_cron().

 */

function sso_user_cron() {

  //$current_time = time() + 6*60*60; 6hr total=21600,12hr total=43200,24hr total=86400, ;

  $current_time = time();

  $state = \Drupal::state();

  $last_update_state = 'sso_user.last_update';

  $last_update= $state->get($last_update_state, 0);

  //every 24hr run the cron.

  if ($current_time - $last_update > 21600) {

    \Drupal::service('sso_user.user')->batchCloseDateMail();

    \Drupal::state()->set($last_update_state, $current_time);

  }

}

/** * Implements hook_cron(). */ function sso_user_cron() { //$current_time = time() + 6*60*60; 6hr total=21600,12hr total=43200,24hr total=86400, ; $current_time = time(); $state = \Drupal::state(); $last_update_state = 'sso_user.last_update'; $last_update= $state->get($last_update_state, 0); //every 24hr run the cron. if ($current_time - $last_update > 21600) { \Drupal::service('sso_user.user')->batchCloseDateMail(); \Drupal::state()->set($last_update_state, $current_time); } }