You don't understand the startdates?
Take, for example, 20260604.2258
Let me stick some spaces in some helpful places:
2026 06 04 . 22 58
That better?
20260604 means 4th June 2026, and 2258 is in 24-hour clock format, IE 10:58PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.