functions.php

<?php

/**
 * Display Posts - Include Event Date
 *
 */
function be_dps_include_event_date( $output, $original_atts, $image, $title, $date, $excerpt, $inner_wrapper, $content, $class, $author, $category_display_text ) {
	if( empty( $original_atts['include_event_date'] ) || false === filter_var( $original_atts['include_event_date'], FILTER_VALIDATE_BOOLEAN ) )
		return $output;

	$key = 'be_event_start';

	$event_date = get_post_meta( get_the_ID(), $key, true );
	if( empty( $event_date ) )
		return $output;

	// Convert to formatted date.
	// See: https://wordpress.org/support/article/formatting-date-and-time
	$event_date = date( 'F j, Y', $event_date );

	// Add span around it for styling
	$event_date = '<span class="event-date">' . $event_date . '</span>';

	// Insert it into the output wherever you'd like it
	$output = '<' . $inner_wrapper . ' class="' . implode( ' ', $class ) . '">' . $image . $title . $event_date . $date . $author . $category_display_text . $excerpt . $content . '</' . $inner_wrapper . '>';
	return $output;
}
add_filter( 'display_posts_shortcode_output', 'be_dps_include_event_date', 10, 11 );