You don't understand the startdates?
Take, for example, 20250917.0845
Let me stick some spaces in some helpful places:
2025 09 17 . 08 45
That better?
20250917 means 17th September 2025, and 0845 is in 24-hour clock format, IE 8:45AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.