From ce7ef7d42068791f53009eae58998494f4c8288a Mon Sep 17 00:00:00 2001
From: Gerald Vogt <vogt@spamcop.net>
Date: Fri, 24 Jul 2015 16:16:49 +0200
Subject: [PATCH] set DTSTAMP for birthday event to date of last contact
 modification Set DTSTAMP to UTC

---
 lib/contact.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/contact.php b/lib/contact.php
index bcc71e4a..5ad3b606 100644
--- a/lib/contact.php
+++ b/lib/contact.php
@@ -779,6 +779,9 @@ class Contact extends VObject\VCard implements IPIMObject {
 			);
 			$vEvent->DTSTART['VALUE'] = 'date';
 			$vEvent->add('DURATION', 'P1D');
+			$lm = new \DateTime('@' . $this->lastModified());
+			$lm->setTimeZone(new \DateTimeZone('UTC'));
+			$vEvent->DTSTAMP->setDateTime($lm);
 			$vEvent->{'UID'} = $this->UID;
 			$vEvent->{'RRULE'} = 'FREQ=YEARLY';
 			$vEvent->{'SUMMARY'} = $title . ' (' . $date->format('Y') . ')';