java.sql.Timestamp value can't be added to dataset

How do you know it didn’t throw an error? (Gateway errors would be in the gateway log.)

Just want to reiterate what Paul said.

Datasets themselves are a more generic structure that are used in other places in Ignition than just the tag system. Columns can be of any type... until you intend to write that dataset to a tag, in which case you're restricted to the types the system knows how to serialize.

8.1.15 has now been released:

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