The JPL ASPIRE test video has a time code for the launch.

Launch timestamp 250:13:30:13.066

Day Of Year:Hour:Minute:Second.Microsecond.

What's the time zone?

  • $\begingroup$ Isn't the Julian date associated with UTC? $\endgroup$
    – Phiteros
    Feb 25, 2021 at 8:57
  • 1
    $\begingroup$ 250 is the day-of-year. $\endgroup$ Feb 25, 2021 at 11:21

2 Answers 2



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.

  • $\begingroup$ 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 R
    Feb 25, 2021 at 18:34

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.


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