You don't understand the startdates?
Take, for example, 20260715.0342
Let me stick some spaces in some helpful places:
2026 07 15 . 03 42
That better?
20260715 means 15th July 2026, and 0342 is in 24-hour clock format, IE 3:42AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.