Stardates Explained - 20200203.2100

You don't understand the startdates?

Take, for example, 20200203.2100

Let me stick some spaces in some helpful places:

2020 02 03 . 21 00

That better?

20200203 means 3rd February 2020, and 2100 is in 24-hour clock format, IE 9:00PM

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

Events on this stardate