按高级自定义字段中输入的日期（日期选择器）对Wordpress帖子进行排序

I am working in a child theme and need to the category posts to be sorts by the custom field date rather than the wordpress publish date. Can anyone point me in the right direction?

This is what I have in my content-single.php file:

        <h1 class="info"><?php the_field('start_date'); ?> - <?php the_field('end_date'); ?></h1>
        <h1 class="info"><?php the_field('time'); ?></h1>
        <h1 class="info"><?php the_field('venue'); ?></h1>
        <a href="<?php the_field('tickets_link'); ?>"><h1 class="buytix">BUY TICKETS<?php the_field('buy_tickets'); ?></h1></a>

        <?php the_content( __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'vantage' ) ); ?>
        <?php wp_link_pages( array( 'before' => '<div class="page-links">' . __( 'Pages:', 'vantage' ), 'after' => '</div>' ) ); ?>
    </div><!-- .entry-content -->

I am very new to php and wordpress. I am working in a child theme. What code do I need to add so that the posts order by the custom field date and where exactly do I need to put it?

You can simply specify in your WP_query() :

See for examples : http://codex.wordpress.org/Function_Reference/WP_Query#Order_.26_Orderby_Parameters