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Stardates Explained - 20151021.2000

You don't understand the startdates?

Take, for example, 20151021.2000

Let me stick some spaces in some helpful places:

2015 10 21 . 20 00

That better?

20151021 means 21st October 2015, and 2000 is in 24-hour clock format, IE 8:00PM

Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.

Events on this stardate

Marty McFly arrives in the Future

In the film "Back To The Future 2", Marty McFly travels forwards 30 years into the future to 2015. The exact time and date of his arrival is October 21st at 4:29pm Pacific time. For us in England that works out to be the 22nd at 0:29am. The future he finds himself in is vastly different to what we've actually got and this lends itself to the running joke of "Where's my [futuristic item]", usually a hoverboard as that was a key macguffin in this and the 3rd movie.

[More...]
When:

Stardate: 20151022.0000
Until:

Stardate: 20151023.0000
Where:
Planet Earth