iphone - How to save the date and time when a Core Data object is created

Question

I want to save & retrive current time (if today) or date of the note created in Core Data

Please guide me on how I can do this.

Answer 1

You can have your custom NSManagedObject subclass set an attribute as soon as it's inserted in a context by overriding the -awakeFromInsert method:

@interface Person : NSManagedObject
@property (nonatomic, copy) NSDate *creationDate; // modeled property
@end

@implementation Person
@dynamic creationDate; // modeled property

- (void)awakeFromInsert
{
    [super awakeFromInsert];

    self.creationDate = [NSDate date];
}
@end

Note that creationDate above is a modeled property of Core Data attribute type "date", so its accessor methods are generated automatically. Be sure to set your entity's custom NSManagedObject class name appropriately as well.