You don't understand the startdates?
Take, for example, 20260625.0045
Let me stick some spaces in some helpful places:
2026 06 25 . 00 45
That better?
20260625 means 25th June 2026, and 0045 is in 24-hour clock format, IE 12:45AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.