Stardates Explained - 20250625.2005

You don't understand the startdates?

Take, for example, 20250625.2005

Let me stick some spaces in some helpful places:

2025 06 25 . 20 05

That better?

20250625 means 25th June 2025, and 2005 is in 24-hour clock format, IE 8:05PM

Stardates in the Star Trek universe work in an entirely different way. Wikipedia has a good explanation on how Stardates work.