You don't understand the startdates?
Take, for example, 20250603.2309
Let me stick some spaces in some helpful places:
2025 06 03 . 23 09
That better?
20250603 means 3rd June 2025, and 2309 is in 24-hour clock format, IE 11:09PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.