我已经尝试过这个解决方案，但没能奏效Run function at specific time

以下是我的示例：

//this is for testing purposes
function my_cron_schedules($schedules){
if(!isset($schedules["1min"])){
    $schedules["1min"] = array(
        \'interval\' => 60,
        \'display\' => __(\'Once a minute\'));
}

return $schedules;
}
add_filter(\'cron_schedules\',\'my_cron_schedules\');

if ( ! wp_next_scheduled( \'my_scheduled_event\' ) ) { wp_schedule_event( 
strtotime( \'2019-01-04 19:39:00\' ), \'1min\', \'my_scheduled_event\' ); }

add_action( \'my_scheduled_event\', \'update_ratings\' );

function update_ratings() { 
//do some stuff
}