You don't understand the startdates?
Take, for example, 20180822.0850
Let me stick some spaces in some helpful places:
2018 08 22 . 08 50
That better?
20180822 means 22nd August 2018, and 0850 is in 24-hour clock format, IE 8:50AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how they work.