如何判断两个时间是否是同一天

- (void)viewDidLoad {

    [super viewDidLoad];

    

    NSString *d = @"2015-03-05 23:59:59";

    NSDateFormatter *format = [[NSDateFormatter alloc] init];

    [format setDateFormat:@"yyyy:MM:dd HH:mm:ss"];

    NSDate *date = [format dateFromString:d];

    NSLog(@"%i", [ViewController isCurrentDay:date]);

}

// 判断两个时间是否是同一天

+ (BOOL)isCurrentDay:(NSDate *)aDate

{

    if (aDate==nil) return NO;

    

    NSCalendar *cal = [NSCalendar currentCalendar];

    NSDateComponents *components = [cal components:(NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay) fromDate:[NSDate date]];

    NSDate *today = [cal dateFromComponents:components];

    components = [cal components:(NSCalendarUnitEra|NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay) fromDate:aDate];

    NSDate *otherDate = [cal dateFromComponents:components];

    if([today isEqualToDate:otherDate])

        return YES;

    

    return NO;

}