I suggest that you create 2 new numeric columns, Work Week and Year.
The formula for Work Week would be
num( word( -1, ::Etiquette, "W" ) );
The formula for Year would be
num( word( 1, :Etiquette, "Y-" ) );
Then you can easily select
:Year == Year( Today() ) & :Work Week < Week Of Year( today() );
Being able to use numeric comparisons should prove to be faster, and les complex
Jim