You don't understand the startdates?
Take, for example, 20011115.0833
Let me stick some spaces in some helpful places:
2001 11 15 . 08 33
That better?
20011115 means 15th November 2001, and 0833 is in 24-hour clock format, IE 8:33AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.