Hi Tettelestai,
Building on 6x6's excellent suggestion to use a filter to show only the rows for the current month.
First, let's construct the date of the first day of the current month in the current year.
Formulas in the table "First day of this month in this year":

A2 is TODAY()
B2 is YEAR(A2)
C2 is MONTH(A2)
D2 is 1 (a number typed to force the first day of this month)
E2 is DATE(B2,C2,1)
You can "hide" (move by cut and paste) to another Sheet if it gets in your way.
Now, a Tick Box in another table. Leave it unticked to show all the data. (You may want to sometimes view all the data.)

Formula in A2 of the table "Filter to show this month" is IF(A1=TRUE,"Showing current month","Showing all rows")

In Table 1 C2 the formula is IF(
Filter to show this month?::A$1=FALSE,"Show",
IF(A2≥First day of this month in this year::E$2,"Show",
"")
)
I used option return to display new lines for more clarity in the formula editor.
Now apply a Filter.
With Table 1 selected, Format Panel > Organise > Filter > Add a Filter > Show? > Text is... Show.

Now turn off the filter (or untick the Tick Box in "Filter to show this month")

You can hide Column C.
Done! Please call back with questions.
Regards,
Ian.