Compare two NSDates in iPhone
===

I am new to iPhone developer,

i want to compare two Dates, first date will come from Database let say, `newDate` and second is todays date,

if today is greater then `newDate` then i want to display alert.

Here is my code snippet,

    NSString *newDate = [formatter stringFromDate:st];
    NSDate *today=[[NSDate alloc]init];
        
        if ([today compare:newDate] == NSOrderedDescending) {
            NSLog(@"today is later than newDate");        
            
        } else if ([today compare:newDate] == NSOrderedAscending) {
            NSLog(@"today is earlier than newDate");
            
        } else {
            NSLog(@"dates are the same");
            
        }

but it crashes, and while compiling it also shows me warning here `[today compare:newDate]`

**Any help will be appreciated.**