WordPressのイベント投稿を開催日と終了日基準に日付アーカイブを作成する方法

https://hoge.com/2019/8

https://hoge.com/2019/8/?post_type=my_event

function my_eventt_query( $query ) {
	if ( $query->is_date() ) {
		$query_object  = get_queried_object();
		$the_post_type = $query_object->name;
		if ( 'my_event' === $the_post_type ) {
			if ( $query->is_year() ) {
				$year = get_query_var( 'year' );
				$from = date( $year . '-01-01' );
				$to   = date( $year . '-12-31' );
			} elseif ( $query->is_month() ) {
				$year  = get_query_var( 'year' );
				$month = get_query_var( 'year' ) . '-' . get_query_var( 'monthnum' );
				$from  = date( 'Y-m-d', strtotime('first day of ' . $month) );
				$to    = date( 'Y-m-d', strtotime('last day of ' . $month) );
			} elseif ( $query->is_day() ) {
				$year  = get_query_var( 'year' );
				$month = get_query_var( 'monthnum' );
				$day   = get_query_var( 'day' );
				$from  = date( $year . '-' . $month . '-' . $day );
				$to    = date( $year . '-' . $month . '-' . $day );
			}
			$meta_query = array(
				'relation' => 'OR',
				array(
					'relation' => 'OR',
					array(
						'key'     => 'from_date',
						'value'   => array( $from, $to ),
						'compare' => 'BETWEEN',
						'type'    => 'DATE',
					),
					array(
						'key'     => 'to_date',
						'value'   => array( $from, $to ),
						'compare' => 'BETWEEN',
						'type'    => 'DATE',
					),
				),
				array(
					'relation' => 'AND',
					array(
						'key'     => 'from_date',
						'value'   => array( '1900-01-01', $from ),
						'compare' => 'BETWEEN',
						'type'    => 'DATE',
					),
					array(
						'key'     => 'to_date',
						'value'   => array( $to, '2999-12-31' ),
						'compare' => 'BETWEEN',
						'type'    => 'DATE',
					),
				),
			);			
			$query->set( 'meta_key', 'from_date' );
			$query->set( 'orderby', 'meta_value' );
			$query->set( 'year', '' );
			$query->set( 'monthnum', '' );
			$query->set( 'day', '' );
			$query->set( 'meta_query', $meta_query );
		}
	}
}
add_action( 'pre_get_posts', 'my_eventt_query' );