I am having trouble understanding how datepart works as selection criteria when it comes to Access queries and forms. Basically, I have a query that captures all of the volunteer's work schedules. What I want to do is allow the user to input a date and for the form to display all of the work schedules for the week in which the date falls. Here is the query:

SELECT DatePart("ww",[WorkDate],1,3) AS WeekNo, tbl_Work_Schedule.WorkDate, tbl_Work_Schedule.Volunteer_ID, tbl_Volunteers.LastName, tbl_Volunteers.FirstName, tbl_Work_Schedule.Work_Location, tbl_Work_Schedule.Hours_Worked, [LastName] & ", " & [FirstName] AS VolunteerName
FROM tbl_Volunteers INNER JOIN tbl_Work_Schedule ON tbl_Volunteers.ID = tbl_Work_Schedule.Volunteer_ID
WHERE (((DatePart("ww",[WorkDate],1,3))=DatePart("ww",[forms]![frm_Work_Schedules]![WeekDate],1,3)))
ORDER BY tbl_Work_Schedule.WorkDate, [LastName] & ", " & [FirstName];

Interestingly, I can run the query outside of the form by entering a parameter for "WeekDate" when prompted and I get records. But the query doesn't display records when it is the record source for the form.
Other than making the user input a date range, how can I get the form to display the records for the week? What am I doing wrong???