<?php 
if ( function_exists( 'ombre_post_format') ) {
    ombre_post_format(); 
} else {
?>
<div <?php post_class(); ?> id="post-<?php the_ID(); ?>">
    <article class="grid-container">
<?php 
    if (has_post_thumbnail()) { 
        $thumb_id = get_post_thumbnail_id();
        $thumb_url_array = wp_get_attachment_image_src($thumb_id, 'large', true);
        $thumb_url = $thumb_url_array[0];
?>
        <div class="grid-img">
            <a href="<?php the_permalink(); ?>" class="o-gallery link">
                <img src="<?php echo esc_url($thumb_url); ?>" alt="<?php the_title_attribute(); ?>" />
            </a>
        </div>
    <?php } ?>
        <div class="grid-content">
            <div class="postdate">
                <a href="<?php the_permalink(); ?>">
                    <?php the_time(get_option('date_format')); ?>
                </a>
            </div>
            <h4><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h4>
            <?php the_excerpt(); ?>
        </div> 
    </article>
</div>  
<?php } ?>