Change UNIX timestamp to M/D/Y

StartDate timestamp from UNIX

add_action( 'genesis_before_entry_content', 'mmi_sing_project_top');
function mmi_sing_project_top() {
	
	global $post;
		$begindate = genesis_get_custom_field('startdate');
		$enddate = genesis_get_custom_field('finishdate');
	
	echo '<div class="sing-project">';
	. . . . 
	
	echo '<h5>When:</h5> ';
	echo '<p>';
	echo date('m/d/Y', strtotime($begindate));
	echo ' to ';
	echo date('m/d/Y', strtotime($enddate));
	echo '</p>';
	echo '</div>';