Core Data Predicate Date Comparison

Question

Im trying to fetch all the objects in an entity matching a user selectedDate (it\'s an NSDate). The Core Data code is fine but my predicate keeps returning 0 results, the da

Answer 1

I've recently spent some time attempting to solve this same problem and have resolved the following, now updated for iOS 8 and above...

NSDate *dateDay = nil;
NSDate *dateDayStart = nil;
NSDate *dateDayNext = nil;

dateDay = <>;  //for example - selectedDate

dateDayStart = [[NSCalendar currentCalendar] startOfDayForDate:dateDay];

//  dateDayNext EITHER
dateDayNext = [dateDayStart dateByAddingTimeInterval:(24 * 60 * 60)];

//  dateDayNext OR
NSDateComponents *dateComponentDay = nil;
dateComponentDay = [[NSDateComponents alloc] init];
[dateComponentDay setDay:1];
dateDayNext = [[NSCalendar currentCalendar] dateByAddingComponents:dateComponentDay
                                                            toDate:dateDayStart
                                                           options:NSCalendarMatchNextTime];

...and the NSPredicate for the Core Data NSFetchRequest (as already shown above in other answers)...

[NSPredicate predicateWithFormat:@"(dateAttribute >= %@) AND (dateAttribute < %@)", dateDayStart, dateDayNext]]