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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Hi all.</p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I wish all of you good luck and strong health in whole 2021 :)</p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">I would like to ask for help with time zone problem. I discovered this problem when I need to sync my Samsung telephone with Kolab account. Task stop at calendar sync and contacts are not sync at all. I use Kontact at desktop and here is not seen any problem but at Roundcubemail web GUI I cannot save or modify any item in Tasks. After modification error message appears: Server error: (Internal Server Error) Can someone give me advice where could be a trouble? Is it possible to refresh cache by hand, or clear it? Here are parts of log files:</p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">kolab-syncroton/errors.log:</p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">[11-Jan-2021 09:09:32,693889 +0100]: [CRIT] {"user":"user@domain.com","cmd":"Sync","device":"SEC1A8FD0F12A723","type":"SAMSUNGSMN910C"} Syncroton_Server::_handlePost::168 #0 /usr/sh</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">are/kolab-syncroton/lib/kolab_sync_backend_state.php(44): kolab_sync_backend_common->create(Object(Syncroton_Model_SyncState)) </span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#1 /usr/share/kolab-syncroton/lib/ext/Syncroton/Command/Sync.php(999): kolab_sync_backend_state->create(Object(Syncroton_Model_SyncState), true) </span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#2 /usr/share/kolab-syncroton/lib/ext/Syncroton/Server.php(147): Syncroton_Command_Sync->getResponse() </span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#3 /usr/share/kolab-syncroton/lib/ext/Syncroton/Server.php(70): Syncroton_Server->_handlePost() </span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#4 /usr/share/kolab-syncroton/lib/kolab_sync.php(176): Syncroton_Server->handle() </span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#5 /usr/share/kolab-syncroton/index.php(31): kolab_sync->run() </span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#6 {main} </span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">[13-Jan-2021 10:06:57,077667 +0100]: [WARN] {"user":"user@domain.com","cmd":"Sync","device":"SEC1A8FD0F12A723","type":"SAMSUNGSMN910C"} Syncroton_Command_Sync::handle::329 failed to</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">add entry DateTimeZone::__construct(): Unknown or bad timezone (+0100)</span></p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">roundcubemail/errors.log</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">[14-Jan-2021 11:47:12 Europe/Prague] PHP Fatal error:  Uncaught exception 'Exception' with message 'DateTimeZone::__construct(): Unknown or bad timezone (Z)' in /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_cache.php:1079</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">Stack trace:</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#0 /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_cache.php(1079): DateTimeZone->__construct('Z')</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#1 /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_cache.php(810): kolab_storage_cache->_unserialize(Array)</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#2 /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_folder.php(301): kolab_storage_cache->select(Array, false, true)</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#3 /usr/share/roundcubemail/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php(590): kolab_storage_folder->select(Array, true)</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#4 /usr/share/roundcubemail/plugins/tasklist/tasklist.php(1081): tasklist_kolab_driver->count_tasks('VGFza3M')</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#5 [internal function]: tasklist->fetch_counts()</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#6 /usr/share/roundcubemail/program/lib/Roundcube/rcube_plugin_api.php(522): call_user_func(Array)</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">#7 /usr/share/roundcubemail/index.php(298): rcube_plugin_api->exec_action('task in /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_cache.php on line 1079</span></p>

<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">Thank you very much for each advice.</span></p>

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;"><span style=" font-family:'monospace';">Greetings, ladas</span></p></body></html>