Displaying the Month and Year that a page was Created?

This worked for me. I created variables for both the month of the post and the year of the post.

<?php
    $post_month  = get_the_time('F');
    $post_year = get_the_time('Y'); 
    if ( is_page('about/mission-statement/')) {
        echo '<time>' . $post_month . ' ' . $post_year . ':' . '</time>';
    }
?>