LDT 
It describes the number of nanoseconds elapsed since 1970-01-01-00:00:00.
The representation of the LDT DataType in the address space is shown in the following table:
| Name | Attribute |
|---|---|
| NodeId | ns=1;i=3015 |
| NamespaceUri | http://PLCopen.org/OpcUa/IEC61131-3/ |
| BrowseName | LDT |
| IsAbstract | False |
| SubtypeOf | Int64 |
| Categories |