Yeah, it should work, this document says the same.
Just thought to make it explicit (as in, create as an extracted field with regex, just to make sure).
Also, you said you tried this:
sourcetype="my_source_type"
| eval _time=message.time
| eval timetest=_time
| dedup message.userId
| table _time, timetest, message.time
Try this:
sourcetype="my_source_type"
| eval oldtime=_time
| eval _time=message.time
| eval timetest=_time
| dedup message.userId
| table oldtime, _time, timetest, message.time
Is _time showing the same timestamp as oldtime? If yes, it somehow didn't get overwritten by message.time...
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