Display user last login time/date

functions.php

/**
 * Capture user login and add it as timestamp in user meta data
 *
 */
function 12kdksd212_user_last_login( $user_login, $user ) {
    update_user_meta( $user->ID, 'last_login', time() );
}

add_action( 'wp_login', '12kdksd212_user_last_login', 10, 2 );
 
/**
 * Display last login time
 *
 */
function 12kdksd212_lastlogin() { 
    $last_login     = get_the_author_meta( 'last_login' );
    $the_login_date = human_time_diff( $last_login );

    return $the_login_date; 
}