If if turns out you need everything since the previous Sunday, (week-to-date) you could use:
>=(Date() - WeekDay(Date()) + 1 )
If you want everything for last week, it could be done in code, but I would recommend putting start date and end date on a form and using those in a "between" statement in your query. You could always preload the form using the default property and allow the user to type over the defaults...
HTH,
Bob
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