根据documentation, wc_memberships_get_user_memberships() 返回WC_Memberships_User_Membership 对象。

这个WC_Memberships_User_Membership 类具有get_end_date() 方法返回到期日期。

因此，您应该能够这样做：

// Get memberships for the current user.
$memberships = wc_memberships_get_user_memberships();

// Verify that they have some memberships.
if ( $memberships ) {
  foreach( $memberships as $membership ) {
    // Print the expiration date in mysql format.
    echo $membership->get_end_date();
  }
}