TEC - Adds day headers between events in the loop when the day has changed

functions.php

<?php

/**
 * Adds day headers between events in the loop when the day has changed
 *
 **/
add_filter( 'tribe_events_list_the_date_headers', 'the_date_headers_add_day_header_separator', 10, 1 );

function the_date_headers_add_day_header_separator ( $html ){

	if ( !empty( $html ) ) {
		return $html;
	}

	global $post, $wp_query;

	$event_day = tribe_get_start_date( $post, false, 'j' );
	$date_without_year = tribe_get_date_option( 'dateWithoutYearFormat', 'F j' );

	if ( $wp_query->current_post > 0 ) {
		$prev_post = $wp_query->posts[ $wp_query->current_post - 1 ];
		$prev_event_day = tribe_get_start_date( $prev_post, false, 'j' );
	}

	/*
	 * If the day changed since the last event in the loop
	 */
	if ( $wp_query->current_post === 0 || ( $prev_event_day != $event_day ) ) {
		$html .= sprintf( "<span class='tribe-events-list-separator-month'><span>%s</span></span>", tribe_get_start_date( $post, false, $date_without_year ) );
	}

	return $html;

}