Stardates Explained - 20200430.1900

You don't understand the startdates?

Take, for example, 20200430.1900

Let me stick some spaces in some helpful places:

2020 04 30 . 19 00

That better?

20200430 means 30th April 2020, and 1900 is in 24-hour clock format, IE 7:00PM

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