Fixes Time.ly ai1ec GMT/BST issues, (events being a day behine in summer)

functions.php

/**
 * Get start and end of BST.
 */
$bst-month = date( 'Y/03/d', strtotime('last sunday of march' ) );
$gmt-month = date( 'Y/10/d', strtotime('last sunday of october' ) );
$event_date_sanitized = $datetime->format( 'Y/m/d' );

if ( $result->allday ){
  if ( $event_date_sanitized >= $bst-month && $event_date_sanitized <= $gmt-month ){
    $datetime->modify( '+1 day' );
    $bstorgmt = 'bst';
   } elseif ( $event_date_sanitized >= $gmt-month ) {
    $datetime->modify( '+0 day' );
    $bstorgmt = 'gmt';
   }
}