Deluge script Query

I am Sorry if this is not the appropriate place to ask help regarding Deluge

I am creating a Internal Apt Rental Classified for our student community at Portland state. www.isa.pdx.edu

In views I only want to see records less than one month old. How do I set the criteria or filter to do that.

This is my view definition and submitted_on is the date of record addition. So only display when Submitted_on-Current_date<=30

summary "ISAs Housing Finder view all"
{
show all rows from ISAs_Housing_Finder_Form
(
Submitted_on
YourName as "Your Name"
YourEmail as "Your Email"
YourPhoneNo as "Your Phone No"
LookingFor as "Looking For"
RoomAddress as "Room Address"
Availablefrom as "Available from"
Comments
)
filters
(
LookingFor
)
}

I would appreciate any suggestions.

PS It would be nice to have a Deluge help forum