event-organiser-ical-feed-workaround.php

<?php
/*
 * Plugin Name: Event Organiser iCal feed work around
 * Version: 1.0
 * License:       GNU General Public License, v2 (or newer)
 * License URI:  http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * Description: Implements a work around for feeds with invalid DTSTART/DTEND properties.
 */
 
 /**
  * This plug-in provides a fix for when an iCal feed contains incorrectly formatted DTSTART
  * or DTEND properties for its events.
  * 
  * Specifically this is for use with feeds where the VALUE modifier is not set correctly. For all 
  * day events, the start date should (for example) be given as
  *
  * DTSART;VALUE=DATE:20153101
  *
  * and NOT
  *
  * DTSART:20153101
  *
  * This will typically result in a error: "[Line X] Invalid datetime “20153101″. Date expected in YYYYMMDDTHHiissZ or YYYYMMDDTHHiiss format.
  * This is intended as workaround, and you should encourage the source of the iCal feed to correct the mistake.
  **/
 
 /**
  * IMPORTANT: Requires Event Organiser 2.10.0 (or better)
 **/

add_filter( 'eventorganiser_pre_ical_property_dtstart', 'my_alter_parsed_date', 10, 5 );
add_filter( 'eventorganiser_pre_ical_property_dtend', 'my_alter_parsed_date', 10, 5 );

function my_alter_parsed_date( $skip, $value, $modifier, $ical_parser, $property ){

	$meta    = false;
	$date_tz = false;
	
	//Parse any modifiers
	if( !empty( $modifiers ) ):
		foreach( $modifiers as $modifier ):
			if ( stristr( $modifier, 'TZID' ) ){
			
				$date_tz = $ical_parser->parse_timezone( substr( $modifier, 5 ) );

			}elseif( stristr( $modifier, 'VALUE' ) ){
				$meta = substr( $modifier, 6 );
			}
		endforeach;
	endif;
	
	//Set timezone
	if( empty( $date_tz ) )
		$date_tz = $ical_parser->calendar_timezone;
			
	//Parse date / date-time of property
	if(  $meta === 'DATE' ):
		$date = $ical_parser->parse_ical_date( $value );
		$allday = 1;
	else:
		try{			
			$date = $ical_parser->parse_ical_datetime( $value, $date_tz );
			$allday = 0;
		}catch( Exception $e ){
			$date = $ical_parser->parse_ical_date( $value );
			$allday = 1;
		}				
	endif;

	//Set date / date-time of property
	if( !empty( $date ) ){
					
		switch( $property ):
			case'DTSTART':
				$ical_parser->current_event['start'] = $date;
				$ical_parser->current_event['all_day'] = $allday;
			break;

			case 'DTEND':
				if( $allday == 1 )
					$date->modify('-1 second');
				$ical_parser->current_event['end'] = $date;
			break;
		endswitch;

	}
	
	return true;
}