You don't understand the startdates?
Take, for example, 19990811.1011
Let me stick some spaces in some helpful places:
1999 08 11 . 10 11
That better?
19990811 means 11th August 1999, and 1011 is in 24-hour clock format, IE 10:11AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.