dateByAddingComponents:toDate:options: vs dateByAddingTimeInterval:

dateByAddingTimeIntervalTests.m

//
// Created by azu on 2013/06/23.
// License MIT
//


#import <SenTestingKit/SenTestingKit.h>


#define SECONDS_IN_MINUTE 60
#define MINUTES_IN_HOUR 60
#define DAYS_IN_WEEK 7
#define SECONDS_IN_HOUR (SECONDS_IN_MINUTE * MINUTES_IN_HOUR)
#define HOURS_IN_DAY 24
#define SECONDS_IN_DAY (HOURS_IN_DAY * SECONDS_IN_HOUR)

// Test large Adding days
#define kAddingDays 10000

@interface dateByAddingTimeIntervalTests : SenTestCase
@end

@implementation dateByAddingTimeIntervalTests {
}

- (void)testDateByAddingTimeInterval {
    NSDate *leapYearDate = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDate *aHundredDays = [leapYearDate dateByAddingTimeInterval:(SECONDS_IN_DAY * kAddingDays)];
    NSDateComponents *diffComponents = [calendar components:NSDayCalendarUnit fromDate:leapYearDate toDate:aHundredDays options:0];
    STAssertEquals([diffComponents day], kAddingDays, @"diff is %ddays", kAddingDays);
}

- (void)testDateByAddingComponents {
    NSDate *leapYearDate = [NSDate date];
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *aHundredDaysComponents = [[NSDateComponents alloc] init];
    aHundredDaysComponents.day = kAddingDays;
    NSDate *aHundredDays = [calendar dateByAddingComponents:aHundredDaysComponents toDate:leapYearDate options:0];
    NSDateComponents *diffComponents = [calendar components:NSDayCalendarUnit fromDate:leapYearDate toDate:aHundredDays options:0];
    STAssertEquals([diffComponents day], kAddingDays, @"diff is %ddays", kAddingDays);
}
@end

dateByAddingTimeInterval: is fail

-[dateByAddingTimeIntervalTests testDateByAddingComponents] : '9999' should be equal to '10000': diff is 10000days