- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    //时间格式 2015-07-20 18:34:31

    NSLog(@"%ld",[self getTimeInterval:@"2015-07-20 00:00:00"]);

}

//计算时间差

- (NSInteger)getTimeInterval:(NSString *)sendDateString

{

    NSInteger minute;

    if (sendDateString ==nil||sendDateString.length==0) {

        ;

    }

    else

    {

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

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

        //现在时间

        NSDate * currentdate = [NSDate date];

        NSDate * currentDate = [dateFormatter dateFromString:[dateFormatter stringFromDate: currentdate]];

        NSLog(@"---currentdate--%@",currentDate);

        //结束时间

        NSDate * endDate = [dateFormatter dateFromString:sendDateString];

        NSLog(@"---endDate--%@",endDate);

        //得到时间差

        NSTimeInterval time = [currentDate timeIntervalSinceDate:endDate];

        NSLog(@"---time---%ld",(long)time);

        NSLog(@"--minitus--%ld",(long)time);

        NSLog(@"---days--%d",((int)time)/(3600*24));

        NSLog(@"---hours--%d",((int)time)%(3600*24)/3600);

    }

    return minute;

}

2015-10-23 10:14:12.467 计算时间差[1519:59582] ---currentdate--2015-10-23 02:14:12 +0000

2015-10-23 10:14:12.467 计算时间差[1519:59582] ---endDate--2015-07-19 16:00:00 +0000

2015-10-23 10:14:12.467 计算时间差[1519:59582] ---time---8244852

2015-10-23 10:14:12.467 计算时间差[1519:59582] --minitus--8244852

2015-10-23 10:14:12.467 计算时间差[1519:59582] ---days--95

2015-10-23 10:14:12.468 计算时间差[1519:59582] ---hours--10

2015-10-23 10:14:12.468 计算时间差[1519:59582]