You don't understand the startdates?
Take, for example, 19990216.1012
Let me stick some spaces in some helpful places:
1999 02 16 . 10 12
That better?
19990216 means 16th February 1999, and 1012 is in 24-hour clock format, IE 10:12AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.