ios - 奇妙な iOS 5 FetchedResultsController 述語の問題

Question

このコードは iOS 6 では問題なく動作しますが、iOS 5 では結果が返されません。日付はカテゴリ メソッドで今日に設定されます。誰かが奇妙な何かを見つけることができますか？ありがとう！

NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"KSJob"];

NSLog(@"today: %@", [NSDate today]);

// We only want to show upcoming jobs.
[fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"scheduledOn > %@", [NSDate today]]];

fetchRequest.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"scheduledOn" ascending:YES]];
self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
                                                                managedObjectContext:[(id)[[UIApplication sharedApplication] delegate]managedObjectContext]                                                 sectionNameKeyPath:@"dateToStringForSectionTitles"
                                                                           cacheName:@"UpcomingJobs"];
self.fetchedResultsController.delegate = self;

NSDate カテゴリ メソッド:

+ (NSDate*) today
{
    NSCalendar *cal = [NSCalendar currentCalendar];
    NSDateComponents *components = [cal components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit ) fromDate:[[NSDate alloc] init]];
    components.timeZone = [NSTimeZone localTimeZone];
    components.hour = 0;
    components.minute = 0;

    NSDate *today = [cal dateByAddingComponents:components toDate:[[NSDate alloc] init] options:0];    
    return today;
}