Trying to Update link_updated Column in wp_links

Currently working on an addon that will take a list of links and insert them into the database.

I have tried setting link_updated in my array prior to sending the call to insert or update a new link, but link_updated never gets set. It always remains at its default value.

I have confirmed that the date I’m trying to set is accurate and not null (and is in the correct format for the db ex: 2011-04-07 00:00:00).

$linkdata = array(
  "link_url"=> $link, // varchar, the URL the link points to
  "link_name" => $title, // varchar, the title of the link
  "link_target" => '_blank', // varchar, the target element for the anchor tag
  "link_description" => $desc, //varchar a short description of the link
  "link_visible" => 'Y', // varchar, Y means visible, anything else means not
  "link_owner" 	=> '1', // integer, a user ID
  "link_updated" => $fullDate, // datetime, when the link was last updated
  "link_category" => $term_id // int, the term ID of the link category. if empty, uses default link category
);
$link_id = wp_insert_link( $linkdata );  //insert or update our link

Everything gets inserted or updated as expected, except for the date.

Thanks!