Retrieve post modified date for specific post by post ID

I am looking to use the ‘the_modified_date’ function to display the date and time of a specific post has been modified. This information will appear in the header of our website on every single page.

How would I go about completing this?

I can use to get the title, and was hoping there would be a way just as easy to display that posts date and time.

Thank you for your help.

Place this code snippet put in function.php, this should give you what you need.

function my_theme_wp_title( $title, $sep ) {
    global $post;

    /* my other title cases */

    //get post's modified date
    $m_date = get_the_modified_date();

    //concatenate the current title with the date string, using the separator to be more clear
    $title .= $sep . " " . $m_date;

    return $title;
}
add_filter( 'wp_title', 'my_theme_wp_title', 10, 2 );

Basically we add our custom function hooked to the wp_title filter, thus altering wp_title function, giving us the flexibility to add custom logic in the title display.

Cheers!