SQL report questions for getdate

I have written a report to show which tickets that haven't been edited(modified) in 30 days.  It works great but every monday I have to manually change the date modified. In helpdesk I had one that used datediff and getdate > 30. The problem is I can't figure out who to make it happen in Servicedesk. Can anyone give me some direction.  Here is the SQL

 

select distinct
    Process.ReportLogProcessID as [Process.ReportLogProcessID],
    Process.ReportProcessID as [Process.ReportProcessID],
    Process.ProcessStarted as [Process.ProcessStarted],
    Process.ProcessTitle as [Process.ProcessTitle],
    Process.Result as [Process.Status],
    Process.SessionID as [Process.SessionID],
    Process.ProcessViewerPageID as [Process.ProcessViewerPageID],
    Task0.TaskID as [Task.TaskID],
    Task0.RespondDisplayFormat as [Task.RespondDisplayFormat],
    [dbo].GetTaskAssignments(Task0.TaskID) as [Task.TaskAssignments],
    Task0.FormWidth as [Task.FormWidth],
    Task0.FormHeight as [Task.FormHeight],
    TaskResponse3.URL as [Task.ResponseURL],
    TaskResponse3.Title as [Task.ResponseTitle],
    TaskResponse3.Description as [Task.ResponseDescription],
    TaskResponse3.TaskResponseID as [Task.TaskResponseID],
    LastModified4.LastModified as [LastModified.LastModified]
from
    ReportProcess as Process with (NOLOCK) inner join
    Task as Task0 with (NOLOCK) on
        ((Task0.SessionID = Process.SessionID)) inner join
    TaskAssignment as TaskAssignment1 with (NOLOCK) on
        ((TaskAssignment1.TaskID = Task0.TaskID)) left outer join
    [Group] as Group1 with (NOLOCK) on
        ((Group1.GroupID = TaskAssignment1.ReferenceID)) left join
    TaskResponse as TaskResponse3 with (NOLOCK) on
        ((TaskResponse3.TaskID = Task0.TaskID and
    (select count(*) c from TaskResponse where TaskResponse.TaskID = Task0.TaskID) < 2)) inner join
    LastModified as LastModified4 with (NOLOCK) on
        ((LastModified4.LastModified <= '12/7/2012 12:00:00 AM' and
    LastModified4.SessionID = Process.SessionID))
where
    (Task0.DoNotShowInTaskList = 'False' and
    Task0.IsCompleted = 'False')
order by
    [LastModified.LastModified] asc

 

Thank You

Jen