Booked plugin - a fix plugin for the problem

fixme_booked.php

<?php
/*
Plugin Name: fixme test for booked plugin
Using: place it in the plugins dir and activate from wp-admin
*/

if( ! function_exists( 'mplus_fix_query' ) )
{
    function mplus_fix_query( $args ) {
        // echo '<pre>'.print_r($args, true).'</pre>';

        $start_timestamp = (int) $args['meta_query'][0]['value'][0];
        $end_timestamp   = (int) $args['meta_query'][0]['value'][1];

        $start_timestamp = $start_timestamp + 1;
        $end_timestamp   = $end_timestamp - 1;

        $args['meta_query'][0]['value'][0] = $start_timestamp;
        $args['meta_query'][0]['value'][1] = $end_timestamp;

        // echo '<pre>'.print_r($args, true).'</pre>';

        return $args;
    }
    add_filter( 'booked_fe_date_content_query', 'mplus_fix_query' );
}

?>