Time bias of group
TimeBias indicates the time difference between
the server and client machines. In some cases the data may have been
collected by a device operating in a time zone other than that of
the client. Then it will be useful to know what the time of the device
was at the time the data was collected (e.g., to determine what shift
was on duty at the time).
The time is specified in minutes and can be positive or negative.
The default value is