Add body class "past-event" to single event view for The Events Calendar by Modern Tribe

gistfile1.txt

	add_filter( 'body_class', 'tribe_events_past_events_body_class' );

	function tribe_events_past_events_body_class( $classes ) {

		// Check if the Events Calendar main class exists and if not just return the classes
		if ( ! class_exists( 'Tribe__Main' ) ) {
			return $classes;
		}
		// Check if we are viewing a single event
		if ( is_singular( 'tribe_events' ) ) {

			// Retrieve the event details and calculate if it has passed or not
			$event = get_queried_object();
			// This code copied from Single_Event.php where an event has passed check is made
			$gmt_offset = ( get_option( 'gmt_offset' ) >= '0' ) ? ' +' . get_option( 'gmt_offset' ) : ' ' . get_option( 'gmt_offset' );
			$gmt_offset = str_replace( array( '.25', '.5', '.75' ), array( ':15', ':30', ':45' ), $gmt_offset );

			if ( ! tribe_is_showing_all() && strtotime( tribe_get_end_date( $event->ID, false, 'Y-m-d G:i' ) . $gmt_offset ) <= time() ) {
				$classes[] = 'tribe-is-past';
			}
		}

		return $classes;
	}