timezone problem?

[ladas at seznam.cz]

Hi all.

I wish all of you good luck and strong health in whole 2021 :)

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:

kolab-syncroton/errors.log:
[11-Jan-2021 09:09:32,693889 +0100]: [CRIT] {"user":"user at domain.com","cmd":"Sync","device":"SEC1A8FD0F12A723","type":"SAMSUNGSMN910C"} Syncroton_Server::_handlePost::168 #0 /usr/sh
are/kolab-syncroton/lib/kolab_sync_backend_state.php(44): kolab_sync_backend_common->create(Object(Syncroton_Model_SyncState)) 
#1 /usr/share/kolab-syncroton/lib/ext/Syncroton/Command/Sync.php(999): kolab_sync_backend_state->create(Object(Syncroton_Model_SyncState), true) 
#2 /usr/share/kolab-syncroton/lib/ext/Syncroton/Server.php(147): Syncroton_Command_Sync->getResponse() 
#3 /usr/share/kolab-syncroton/lib/ext/Syncroton/Server.php(70): Syncroton_Server->_handlePost() 
#4 /usr/share/kolab-syncroton/lib/kolab_sync.php(176): Syncroton_Server->handle() 
#5 /usr/share/kolab-syncroton/index.php(31): kolab_sync->run() 
#6 {main} 
[13-Jan-2021 10:06:57,077667 +0100]: [WARN] {"user":"user at domain.com","cmd":"Sync","device":"SEC1A8FD0F12A723","type":"SAMSUNGSMN910C"} Syncroton_Command_Sync::handle::329 failed to
add entry DateTimeZone::__construct(): Unknown or bad timezone (+0100)

roundcubemail/errors.log
[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
Stack trace:
#0 /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_cache.php(1079): DateTimeZone->__construct('Z')
#1 /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_cache.php(810): kolab_storage_cache->_unserialize(Array)
#2 /usr/share/roundcubemail/plugins/libkolab/lib/kolab_storage_folder.php(301): kolab_storage_cache->select(Array, false, true)
#3 /usr/share/roundcubemail/plugins/tasklist/drivers/kolab/tasklist_kolab_driver.php(590): kolab_storage_folder->select(Array, true)
#4 /usr/share/roundcubemail/plugins/tasklist/tasklist.php(1081): tasklist_kolab_driver->count_tasks('VGFza3M')
#5 [internal function]: tasklist->fetch_counts()
#6 /usr/share/roundcubemail/program/lib/Roundcube/rcube_plugin_api.php(522): call_user_func(Array)
#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

Thank you very much for each advice.
Greetings, ladas
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