You don't understand the startdates?
Take, for example, 20260119.0333
Let me stick some spaces in some helpful places:
2026 01 19 . 03 33
That better?
20260119 means 19th January 2026, and 0333 is in 24-hour clock format, IE 3:33AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.