You don't understand the startdates?
Take, for example, 20260718.0438
Let me stick some spaces in some helpful places:
2026 07 18 . 04 38
That better?
20260718 means 18th July 2026, and 0438 is in 24-hour clock format, IE 4:38AM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.