The JPL ASPIRE test video has a time code for the launch.
Day Of Year:Hour:Minute:Second.Microsecond.
What's the time zone?
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I think it's UTC. This is based on this page which says
In the early hours of Sept. 7, NASA broke a world record.
Well, 'the early hours' in a US timezone translates to mid day in UTC, and I can't see why, if they're not using local time, they'd use some timezone close-to-but-not UTC, so I therefore think it must be UTC.