Custom search query using meta data not working

I am trying to modify the search results to only include future events that I have added via the meta data but I can’t seem to get this working. Any help would be appreciated! Thank you.

function exclude_old_events( $query ) {
if ( $query->is_search ) {
$yesterday_before_midnight = date(“Y-m-d”, mktime(0, 0, 0, date(“m”),date(“d”)-1,date(“Y”))).’ 23:59:59′;
$meta = array(
array(
‘key’ => ‘_EventStartDate’,
‘value’ => $yesterday_before_midnight,
‘compare’ => ‘>’
));
$query->set( ‘meta_query’, $meta );
}}
add_action( ‘pre_get_posts’, ‘exclude_old_events’ );