Looking for value filter in table based on date value in column

Hi all,

I have the following table in Power BI desktop created. All columns are measures.

I received feedback today that the following employee (name field) started on the 01-2018 at his business unit, and thus should not have written any hours in the month of july. Therefore I want to add a filter or something to make sure that if the contract starting date value (which is written in a column, in a table) is month x, that no registrated hours/contract hours are shown from the months before. But only the months ongoing from the starting date. However, I have NO clue how to achieve this...

Anyone an Idea? Sorry for the very vague description...

Many thanks in advance!