thanks.Server OS times zone?: PRCDatabase timezone?: asia/shanghai in my.cnfPHP timezone? PRC in php.inosTicket Default Timezone? asia/shanghai in admin settingosTicket Agent profile timezone? asia/shanghai in agent settingI think this might be a bug, I find a solution to this, and change the code, it works: https://github.com/liangxinhui/osTicket-Chineseit suggest two change:1. add following code in my.cnfdefault-time_zone='+8'2. change return db_get_variable('system_time_zone', 'global'); in include/mysqli.php to return db_get_variable('time_zone', 'global');