OK, go to Dashboard>Plugins>Installed Plugins and click edit on Post Content Shortcodes.
Edit this file: post-content-shortcodes/class-post-content-shortcodes.php
Find this text:
$this->defaults = apply_filters( 'post-content-shortcodes-defaults', array(
'id' => 0,
'post_type' => 'post',
'order' => 'asc',
'orderby' => 'post_title',
'numberposts' => -1,
'post_status' => 'publish',
'offset' => null,
'category' => null,
'include' => null,
'exclude' => null,
'meta_key' => null,
'meta_value' => null,
'post_mime_type'=> null,
'post_parent' => null,
/* Non-standard arguments */
'exclude_current'=> true,
'blog_id' => $blog_id,
'show_image' => false,
'show_excerpt' => false,
'excerpt_length'=> 0,
'image_width' => 0,
'image_height' => 0,
'show_title' => false,
'show_author' => true,
'show_date' => true,
/* Added 0.3.3 */
'show_comments' => false,
'read_more' => false,
'shortcodes' => false,
) );
And change show_date to true (as in the code above). For some reason these options aren’t available from the shortcode.