You don't need the first date of every week table. Which day of week your week start?
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To filter current week's records.
Div ( potaltable::thedate - 1 ; 7 ) = Div ( Get ( CurrentDate ) - 1 ; 7 )
This shows records 12/10/2015...18/10/2015 now (16/10/2015)
But, the starting your question seems different.
Do you want to show only one of 12/10/2015...18/10/2015 in the portal?
I'd like to just show one record for the current week, as the dates I have stored are just the first day of each week.
If your portal show the records from table of screenshot, the calculation in my previous post filter the 12/10/2015 record in this week.
If the table for portal is another table, are there more than one records having same date?