
You don't understand the startdates?
Take, for example, 20090519.2100
Let me stick some spaces in some helpful places:
2009 05 19 . 21 00
That better?
20090519 means 19th May 2009, and 2100 is in 24-hour clock format, IE 9:00PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.