Time and Date report

The only way to track the date change in reference to an object state change is to use workflow tasks.

Here you can read what is changed in the DB with each date change.

What is the usage of database UPDATESTAMPA2 and MODIFYSTAMPA2 columns in Windchill

Which database table stores "Start Date" and "Date Completed/End Date" of all workflow task/activity of "Routing/Process History" table in Windchill PDMLink

And this is a report to record the dates of each task in the workflow

How to report completed tasks and date/time with QueryBuilder in Windchill PDMLink

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If you just want to report when the state changed, independent of a workflow, you can use the query builder to make something like this:

This will let you get a report that corresponds to the "Life Cycle History" table for the document. It's helpful to compare the query results with this table. You may need to customize your view to see it: 

I usually include this criteria, to only get timestamps when the object entered the state:

There's a lot of help articles on using Query Builder. You'll need to add more criteria to get just the results you're interested in.