You don't understand the startdates?
Take, for example, 20150216.1442
Let me stick some spaces in some helpful places:
2015 02 16 . 14 42
That better?
20150216 means 16th February 2015, and 1442 is in 24-hour clock format, IE 2:42PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.