Change date format

You will need to use strtotime() with Date() to make your own date format

If you already know the meta key that you need you can do the following

$post_meta_data = get_post_meta(get_the_ID(), 'endDate', true);

See get_post_meta for more information about the function.

Now that we have the value and going your format all you need to do is the following

$new_format = Date('d-m-Y', strtotime($post_meta_data));

EDIT

echoing the new format.
I removed the ( ) because they are not needed for echoing string;

echo 'Submission deadline: ' . $new_format;

The whole code combined

<span class="closes-from">
    <?php
    // get end date (maybe change $post_meta_data to a more appropriate name)
    $post_meta_data = get_post_meta(get_the_ID(), 'endDate', true);

    // create a new date format
    $new_format = Date('d-m-Y', strtotime($post_meta_data));

    // output the new date format with some text
    echo 'Submission deadline: ' . $new_format;
    ?>
</span>

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