IOS: NSDateComponents extension with methods to determine whether current Year

NSDateComponents+Extended.h

//
//  NSDateComponents+Extended.h
//  FBBirthdays
//
//  Created by Igor on 2/23/14.
//  Copyright (c) 2014 4Pixels. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSDateComponents (Extended)

/**
 *  Returns YES if year property is leap year, NO otherwise.
 *
 *  @return YES if year property is leap year, NO otherwise.
 */
- (BOOL) isLeapYear;

/**
 *  Returns YES if passed year is leap year, NO otherwise.
 *
 *  @param year the number of year which should determine is it leap or not.
 *
 *  @return YES if passed year is leap year, NO otherwise.
 */
- (BOOL) isLeapYear:(NSInteger)year;

@end

NSDateComponents+Extended.m

//
//  NSDateComponents+Extended.m
//  FBBirthdays
//
//  Created by Igor on 2/23/14.
//  Copyright (c) 2014 4Pixels. All rights reserved.
//

#import "NSDateComponents+Extended.h"

@implementation NSDateComponents (Extended)

- (BOOL) isLeapYear
{
    return ((self.year % 4 == 0) && (self.year % 100 != 0)) || (self.year % 400 == 0);
}

- (BOOL) isLeapYear:(NSInteger)year
{
    return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}

@end