Time Stamping

For both data historization and data retrieval, you must be sure to correctly set and use the DateTime's Kind property to either "Utc" or "Local" and avoid "Unspecified." For retrieval, the Kind of the results will match that of the input parameters.

The DateTime's Kind property must correctly reflect if the value is expressed in the local time zone (on the SDK client computer) or in UTC. Note that the historian infrastructure always transmits and stores data values using UTC.