iphone - NSDate isEqualToDate : not working - does it look at seconds and split seconds?

Question

我不明白为什么这个方法不起作用。使用 isEqualToDate: 时是否查看秒数和分秒数？

//Test that the NSDate category's DatePlusDays: method works
- (void)testNSDateCategoryDatePlusDays
{
    NSInteger numberOdDatesToAdd = 1;

    //Test method
    NSDate *result = [NSDate datePlusDays:numberOdDatesToAdd];

    //Correct result
    NSDate *now = [NSDate date];
    NSDate *correctResult = [now dateByAddingTimeInterval:60*60*24*numberOdDatesToAdd];

    NSLog(@"correct result: %@", correctResult);
    NSLog(@"result %@", result);
    STAssertTrue([correctResult isEqualToDate:result], @"Dates are not equal"); 

}

2011-04-19 09:29:02.939 [49535:207] correct result: 2011-04-20 08:29:02 +0000 2011-04-19 09:29:02.940 [49535:207] result 2011-04-20 08:29:02 +0000

+ (NSDate *)datePlusDays:(NSInteger)days
{
    NSDate *now = [NSDate date];
    return [now dateByAddingTimeInterval:60*60*24*days];
}

Answer 1

它比较到微秒以查看日期是否完全相等。

如果您需要较低的精度，请使用 timeIntervalSinceDate: 来测试彼此之间的微秒、秒、小时、天等范围内的日期。