Tag history timestamp source

Does ignition 8 have a way to change the timestamp source for tag history like in 7.9?

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Nope, this option was removed, but is instead determined by the actual sample mode. OnChange and Periodic uses “value” source, while Tag Group uses “system” source.

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I have try this in Ignition 8.
both modes , On change and Periodic, its the same, Timestamp is generated from server on reception tag!! Why?
I need to store timestamp from device!!