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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$\begingroup$ Isn't the Julian date associated with UTC? $\endgroup$– PhiterosCommented Feb 25, 2021 at 8:57
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1$\begingroup$ 250 is the day-of-year. $\endgroup$– mhoran_psprepCommented Feb 25, 2021 at 11:21
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2 Answers
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UTC
This page gives launch local time as
Friday, September 7, at 9:30 a.m
in Virginia, USA.
Virginia is Eastern Time (GMT-5) and September is in Daylight Savings Time which accounts for the effective 4 hour difference.
answered Feb 25, 2021 at 14:44
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$\begingroup$ Worth noting that giving time in UTC, or "zulu time", is an international standard for aviation in general. Since sending things through the air is a necessary part of sending them into space, no doubt JPL feels obliged to adhere to this standard. $\endgroup$– Seth RCommented Feb 25, 2021 at 18:34
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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.