This primitive data type is a UInt32 that represents the time in seconds since the year 2000. The epoch date is midnight UTC (00:00) on January 1, 2000.
It is used as version number based on the last change time. If the version is updated, the new value shall be greater than the previous value.
If a Variable is initialized with a VersionTime value, the value shall be either loaded from persisted configuration or time synchronization shall be available to ensure a unique version is applied.
The value 0 is used to indicate that no version information is available.