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Stardates Explained - 19990505.1517

You don't understand the startdates?

Take, for example, 19990505.1517

Let me stick some spaces in some helpful places:

1999 05 05 . 15 17

That better?

19990505 means 5th May 1999, and 1517 is in 24-hour clock format, IE 3:17PM

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