Failed in convert NSString from kABBirthdayProperty to NSDate - ios

Question

I tried to convert NSString to NSDate as the instruction: NSString to NSdate
My snippet does not work, maybe the source NSString extracts incorrect
from ABPerson, with kABBirthdayProperty. It gets error with reason:
-[__NSTaggedDate bytes]: unrecognized selector sent to instance 0xc1c3a7619800000d
This is the snippet:
-(void) abRead: (ABPerson*) myRecord
{ if ([myRecord valueForProperty:kABBirthdayProperty] != nil)
{ NSDateFormatter* myBirthday = [[NSDateFormatter alloc] init];
[myBirthday setDateFormat:#"YYYY-DD-MM HH:MM:SS"];
NSDate* birthDay = [myBirthday dateFromString:[myRecord valueForProperty:kABBirthdayProperty]];
}
I guess that the NSString got from kABBirthdayProperty have some special format or some thing. I checked:
NSLog(#"birthday: %#", [myRecord valueForProperty:kABBirthdayProperty]);
it print out as NSString should be:
birthday :1980-02-08 05:00:00 +0000
Do I need any conversion from ABPerson:kABProperty to NSString correctly?
sorry for my bad English.

Answer 1

That property is already an NSDate*, it is not an NSString*. As such, you should not try and convert it from an NSString* to an NSDate* and just use it as an NSDate* directly:
-(void) abRead: (ABPerson*) myRecord {
NSDate* birthDay = [myRecord valueForProperty:kABBirthdayProperty];
if (birthday != nil) {
// Do something with birthday
}
}
The error you are getting actually tells you this:
-[__NSTaggedDate bytes]: unrecognized selector sent to instance 0xc1c3a7619800000d
This is telling you that an instance of type __NSTaggedDate is having the method bytes called on it. This implies that you're treating a type as if it is a different type.