Problems With Timestamp

I have a timestamp field in a database and only want to display the Date. In the query I placed this: Date Received: Format([RItemTimeStamp],"Short Date")

Works fine however if I try to run a query to serach for a date range it doesn't give me all the days.

I then tried this: Date Received: DateValue([RItemTimeStamp])

but get the message that the this expression is typed incorrectly or too complex. Here is the entire sql statement for this query:

SELECT DateValue([RItemTimeStamp]) AS [Date Received], Count(EARNS_Data_tbl.RTransaction) AS [Total EARNS Received], Format([RItemTimeStamp],"Long Time") AS [Time Received], Count(EARNS_Data_tbl.Earns_Processor) AS CountOfEarns_Processor
FROM EARNS_Data_tbl
GROUP BY DateValue([RItemTimeStamp]), Format([RItemTimeStamp],"Long Time")
HAVING (((DateValue([RItemTimeStamp])) Between [Forms]![PowerUserForm]![Start_Time_audit] And [Forms]![PowerUserForm]![End_Date_audit]))
ORDER BY DateValue([RItemTimeStamp]);