Question

How can I display only the Month and Year that a page was created?

Background

I have a page that will get changes has a field that shows the month and year. It needs to be in Month and year format like "December 2013"

Code

I previously had this in my template, to display (for example) December 2013:

<time><?php the_time('F Y') ?>:</time>

But since it will only show up on a specific page I wrote this

<?php 
    if ( is_page('about/mission-statement/')) {
        $post_month_year = get_post_time(get_option('date_format'), false, $post, true);
        echo '<time>' . $post_month_year . ':' . '</time>';
    }
?>

But that gives me the date with the day in addition, December 12, 2013.

So the problem is that variable. I thought I could just do something like

$post_month_year = 'the_time('F Y’)';

I just need the month and year. What did I do wrong and how can I best address this?