You don't understand the startdates?
Take, for example, 20250821.1248
Let me stick some spaces in some helpful places:
2025 08 21 . 12 48
That better?
20250821 means 21st August 2025, and 1248 is in 24-hour clock format, IE 12:48PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.