Validation in the form related to Week number

[N_NAGESH]

Hi,

I have a form with a field name "Date entered". I want date input to be the date between current week and previous week.

Using the validation rule I tried " = between Datepart("ww", now()) and Datepart("ww",now())-1 "

This is not working and gives an error on any entry

Can anyone help me in this regard

Thanks