Build Table filtered by Date

hello,

I would like to filter a table, which has a date dimension, by a specific date.
I have created a new table with the following code:

test = 
FILTER(
    Maschinenstunden,
    Maschinenstunden[Datum] = DATE(YEAR([gewaehltes Datum]),MONTH([gewaehltes Datum]),DAY([gewaehltes Datum]))
)

This does not change the original table in any way.

But if I use the following code it does what it should do:

test = 
FILTER(
    Maschinenstunden,
    Maschinenstunden[Datum] = DATE(2021,3,10))
)

In this case, only the rows containing the specified date, are correctly in the table.

The Mesaure "gewaehltes Datum" is coded like this:

gewaehltes Datum = LASTDATE(Datumstabelle[Datum])

And the outcome is a single cell, which contains the correct date.

Why is this not transferable. So why does only the method with fixed numbers work?

Thank a lot for the help!

And sorry for the german named mesures and variables.

Greets