(_day_of_week([some_date],1) = 1 and _week_of_year([some_date]) = _week_of_year([current_date]))
or
(_day_of_week([some_date],1) = 1 and _week_of_year([some_date]) = _week_of_year([current_date])-1)
based on ISO standard 8601 that day 1 of the week is a monday
Ties Blom