Don't convert date values using unix timestamps to avoid timezone shifts (#2802)

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/Kolab/CardDAV/ContactsBackend.php b/lib/Kolab/CardDAV/ContactsBackend.php
index 3e5f820..90878c7 100644
--- a/lib/Kolab/CardDAV/ContactsBackend.php
+++ b/lib/Kolab/CardDAV/ContactsBackend.php
@@ -711,7 +711,7 @@ class ContactsBackend extends CardDAV\Backend\AbstractBackend
         foreach (array('birthday','anniversary') as $key) {
             if (!empty($contact[$key]) && !$contact[$key] instanceof \DateTime) {
                 try {
-                    $contact[$key] = new \DateTime('@' . \rcube_utils::strtotime($contact[$key]));
+                    $contact[$key] = new \DateTime(\rcube_utils::clean_datestr($contact[$key]));
                 }
                 catch (\Exception $e) {
                     $contact[$key] = null;