You don't understand the startdates?
Take, for example, 20171108.0058
Let me stick some spaces in some helpful places:
2017 11 08 . 00 58
That better?
20171108 means 8th November 2017, and 0058 is in 24-hour clock format, IE 12:58AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.