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Stardates Explained - 19990720.1633

You don't understand the startdates?

Take, for example, 19990720.1633

Let me stick some spaces in some helpful places:

1999 07 20 . 16 33

That better?

19990720 means 20th July 1999, and 1633 is in 24-hour clock format, IE 4:33PM

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