You don't understand the startdates?
Take, for example, 20250403.1346
Let me stick some spaces in some helpful places:
2025 04 03 . 13 46
That better?
20250403 means 3rd April 2025, and 1346 is in 24-hour clock format, IE 1:46PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.