OK, if you create a plugin using hook postbit_display_complete and code like this:
Code:
$this->post['postdate_normal'] = vbdate($this->registry->options['dateformat'], $this->post['dateline']);
Then you can use {vb:raw post.postdate_normal} and it will always be the "actual" (normal) date. As you can probably see by looking at the existing template, {vb:raw post.postdate} will be the "detailed" date (if you have that set in the options), and {vb:raw post.posttime} will contain the time.