In the Events tab just above the thin line that marks where the raw events are shown, just to the right of the fields area, but still the farthest thing to the left on that line, you will see a thing that says either list , raw or table . If you change this to list , then it will add a column called Time to the left of each event in your search results that shows you the event's _time value formatted for the TZ setting in your user profile. This is as close as you can get to what you are asking: there is no setting that changes the values of the raw data's data, but you can add a field that contains a differently formatted version of any time.
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