ENV_TZ (string) If set, it will be used to define the TZ environment variable when a user login. The value can be the name of a timezone preceded by TZ= (for example TZ=CST6CDT), or the full path to the file containing the timezone specification (for example /etc/tzname). If a full path is specified but the file does not exist or cannot be read, the default is to use TZ=CST6CDT.