You don't understand the startdates?
Take, for example, 20260221.2240
Let me stick some spaces in some helpful places:
2026 02 21 . 22 40
That better?
20260221 means 21st February 2026, and 2240 is in 24-hour clock format, IE 10:40PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.