How To Prevent - Last Modified Date/Time - to not show on Pages but only Posts

Question

I have created a separate plugin for WordPress (that's usually called the site-specific plugin) where I added a function to display the last modified date and time. Well, it works good but I don't want to display the same for PAGES but only for Posts.

What should I modify in this code?

    function wpb_last_updated_date( $content ) {
$u_time = get_the_time('U'); 
$u_modified_time = get_the_modified_time('U'); 
if ($u_modified_time >= $u_time + 86400) { 
$updated_date = get_the_modified_time('F jS, Y');
$updated_time = get_the_modified_time('h:i a'); 
$custom_content .= '<p class="last-updated"><b>Last updated on</b> '. $updated_date . ' at '. $updated_time .'</p>';  
} 

    $custom_content .= $content;
    return $custom_content;
}
add_filter( 'the_content', 'wpb_last_updated_date' );

Answer 1

You can check which page is being displayed with these conditions:

is_page()     //For pages
is_single()   //for posts
is_singular() //for posts AND pages
is_category() //for categories
is_tag()      //for tags
is_404()      //for 404 page

Try putting code below which have condition to add custom content to only the posts:

function wpb_last_updated_date( $content ) 
{
      $u_time = get_the_time('U'); 
      $u_modified_time = get_the_modified_time('U');

      if ($u_modified_time >= $u_time + 86400) 
      { 
           $updated_date = get_the_modified_time('F jS, Y');
           $updated_time = get_the_modified_time('h:i a'); 
           if(is_single()) 
           {
                 $custom_content .= '<p class="last-updated"><b>Last updated on</b> '. $updated_date . ' at '. $updated_time .'</p>';  
           }
      }
      $custom_content .= $content;
      return $custom_content;
}
add_filter( 'the_content', 'wpb_last_updated_date' );

For a more complete list of template tags check visit: http://codex.wordpress.org/Function_Reference/is_page