What formula for adding all the values corresponding to a match?

Good morning to everyone.

This is my first time posting a question here. I usually find all the needed answers thanks to the community but I'm completely stuck today and can't find the right formula, or way to do, to get to the finish line.

Pardon my basic question...

Here is what I intend to do:

I have created a table in which I have some dates and the received funds at this date.

Every 3 rows are corresponding to a specific unit.

I have created another table and the goal is to add all the funds received in a specific month.

So for example if the cell I'm checking in the new table gives "8/25", I want to be able to add in the table above all the funds received in August 2025.

Basically something that would say "check all the dates in this entire table and each time it matches add the attached amount".

I've tried different ways with LOOKUP and SUMIF, but never found something that works properly.

Thank you sooooo much in advance for your help!