This OPC UA Property, of DataType BACnetDateTime, represents the BACnet property Start_Time. The BACnetDateTime DataType is defined in 10.5.8.

The Start_Time value indicates the date and time at or after which logging shall be enabled by this variable. The variable is O, and if unspecified is ignored for the purpose of determining whether or not logging is enabled. If Start_Time specifies a time and date that is equal to or later than the Stop_Time then logging shall be disabled.