Having trouble with delegates

I have a view called BlueView that calls a modal view called DatePick. When DatePick is dismissed by pressing a button I would like it to call a method in BlueView. Heres what I have so far:

In BlueViewController.h;

Code:

@protocol dateset
-(void)calculate; 
@end

@interface BlueViewController : UIViewController <dateset> {
	id <dateset> delegate;
(other code here)

@property(assign)id<dateset>delegate;

In BlueViewController.m

Code:

@synthesize delegate;

-(void)calculate {
(the method I would like to be called)

In DatePickController.m

Code:

- (IBAction) selectButtonPressed:(id)sender {
	chooseDate = [datePicker date];
	gotnewdate = 1;
	[delegate calculate];

At this point I am getting an error in DatePickController.m saying that "delegate" is undeclared. Any thoughts would be appreciated. Also, if you think there are other things missing, please let me know.

 

Ok, I declared delegate as an NSObject, and now I get an error stating "NSObject may not respond to -calculate". Any ideas?