Save date object to core data

Question

I have Core Data and one of my entity property is object of type Date (i assume it is NSDate). From JSON response i got date in following format:2016-01-09 22:33:33

When mapping, i'm setting values in my NSManagedObject like that:

 [item setValue:[obj valueForKey:JS_DATE] forKey:CD_DATE];

Where macros are simply string, referring to entity name or json response key for date.

App throw an exception on that, i assume i want to save NSDate with different format. How to fix that?

Thanks.

Use NSDateFormatter to transform the NSString object into NSDate one, or change the property type to NSString, but you may loose some good feature for predicates with NSDate (like <, =<, > or >=). — Larme

Dirk Dirk · Accepted Answer · 2016-10-26T20:52:02

Try something along the lines of

// Setup formatter
myDateFormatter = [[NSDateFormatter alloc] init];
myDateFormatter.locale = [NSLocale localeWithLocaleIdentifier:@"en_US_POSIX"];
myDateFormatter.dateFormat = @"yyyy-MM-dd' 'HH:mm:ss";
myDateFormatter.timeZone = [NSTimeZone timeZoneForSecondsFromGMT:0];

// Use it
NSString *stringFromJSON = @"2016-01-09 22:33:33";
NSDate *date = [myDateFormatter dateFromString:stringFromJSON];

// Validate Date
NSLog(@"Date: %@, date);

You probably have to experiment with locale and timeZone, depending on where you live. Have a look at that tech note for hints: https://developer.apple.com/library/content/qa/qa1480/_index.html

Save date object to core data

1 Answers