Use "date" method inside a core data predicate

I have a list of Task entities in my core data DB.

I want to query only the tasks that their dueDate property is Today.

Now, for technical reasons I want to save the query in my CoreData table as well. (in a different entity). Meaning I have to somehow tell sqlite, to return the current date. I tried using an NSPredicate as such to no avail:

dueDuate > date('now','start of day')

I got an exception:

Unable to parse function name 'date' into supported selector (date) 

Anyway to achieve what I try to do ?