Auto update date time 1 times per day?

You’re looking for wp_cron

if ( ! wp_next_scheduled( 'my_task_hook' ) ) {
  wp_schedule_event( time(), 'daily', 'my_task_hook' );
}

add_action( 'my_task_hook', 'my_task_function' );

And then you define my_task_function() updating the post date.

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