event class offset

if ( self::$current_month == $month && self::$current_year == $year) {
                    // Past, Present, Future class
                    if ( self::$today == $day ) {
                        $ppf .= ' tribe-events-present';
                    } else if ( self::$today > $day -4 ) {
                        $ppf .= ' tribe-events-past';
                    } else if ( self::$today < $day + 4 ) {
                        $ppf .= ' tribe-events-future';
                    }