Events Calendar PRO: Limit Map View to only show today's events by default.

functions.php

<?php

/**
 * Events Calendar PRO: Limit Map View to only show today's events by default.
 *
 * If the Tribe Bar's date seach was used, display that date, else set it to
 * today's date. This operates differently from the default Map View, which
 * displays Upcoming Events, not just Today's Events.
 *
 * @link https://gist.github.com/cliffordp/4fb65c4508da35fddf0a317bc0de36a2
 */
function cliff_tec_map_view_todays_events_by_default( WP_Query $query ) {
	if ( ! function_exists( 'tribe_is_map' ) ) {
		return;
	}

	$is_map_view = (
		tribe_is_map()
		|| Tribe__Events__Pro__Main::instance()->is_pro_ajax_view_request( false, 'map' )
	);

	$date_specified = (
		! empty( $_REQUEST['tribe-bar-date'] )
		|| ! empty( $query->get( 'eventDate' ) )
	);

	if (
		$date_specified
		|| ! $is_map_view
	) {
		return;
	}

	$query->set( 'end_date', current_time( 'Y-m-d' ) );
}

add_action( 'tribe_events_pre_get_posts', 'cliff_tec_map_view_todays_events_by_default', 50 );