You don't understand the startdates?
Take, for example, 20260502.2058
Let me stick some spaces in some helpful places:
2026 05 02 . 20 58
That better?
20260502 means 2nd May 2026, and 2058 is in 24-hour clock format, IE 8:58PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.