You don't understand the startdates?
Take, for example, 19981002.1352
Let me stick some spaces in some helpful places:
1998 10 02 . 13 52
That better?
19981002 means 2nd October 1998, and 1352 is in 24-hour clock format, IE 1:52PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.