You don't understand the startdates?
Take, for example, 20260807.2121
Let me stick some spaces in some helpful places:
2026 08 07 . 21 21
That better?
20260807 means 7th August 2026, and 2121 is in 24-hour clock format, IE 9:21PM
Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.