From 60fea594ae155e7622be987124f9d0197200d381 Mon Sep 17 00:00:00 2001
From: Andrew McMillan <andrew@morphoss.com>
Date: Thu, 7 Oct 2010 14:20:35 -0400
Subject: [PATCH] Handle events which don't have either DTEND *or* DURATION.

---
 inc/RRule-v2.php | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/inc/RRule-v2.php b/inc/RRule-v2.php
index eedb0ca2..db87a12f 100644
--- a/inc/RRule-v2.php
+++ b/inc/RRule-v2.php
@@ -798,8 +798,18 @@ function expand_event_instances( $vResource, $range_start = null, $range_end = n
       $instance_start = $comp->GetProperty('DTSTART');
       $dtsrt = new RepeatRuleDateTime( $instance_start->Value(), $instance_start->GetParameterValue('TZID'));
       $instance_end = $comp->GetProperty($end_type);
-      $dtend = new RepeatRuleDateTime( $instance_end->Value(), $instance_end->GetParameterValue('TZID'));
-      $duration = $dtstart->RFC5545Duration( $dtend );
+      if ( isset($instance_end) ) {
+        $dtend = new RepeatRuleDateTime( $instance_end->Value(), $instance_end->GetParameterValue('TZID'));
+        $duration = $dtstart->RFC5545Duration( $dtend );
+      }
+      else {
+        if ( $instance_start->GetParameterValue('VALUE') == 'DATE' ) {
+          $duration = 'P1D';
+        }
+        else {
+          $duration = 'P0D';  // For clarity
+        }
+      }
     }
     else {
       $duration = $duration->Value();