ios时间计算 刚刚－几分钟前－几小时前……

• (NSString *)compareCurrentTime:(NSString *)str
  {

  //把字符串转为NSdate
  NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
  [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
  NSDate *timeDate = [dateFormatter dateFromString:str];
  //八小时时区
  NSTimeZone *zone = [NSTimeZone systemTimeZone];
  NSInteger interval = [zone secondsFromGMTForDate: timeDate];
  NSDate *mydate = [timeDate dateByAddingTimeInterval: interval];
  NSDate *nowDate =[[NSDate date] dateByAddingTimeInterval: interval];
  // 两个时间间隔
  NSTimeInterval timeInterval= [mydate timeIntervalSinceDate:nowDate];
  timeInterval = -timeInterval;

  NSLog(@"时间是%f",timeInterval);

  long temp = 0;
  NSString *result;
  if (timeInterval < 60) {
  result = [NSString stringWithFormat:@"刚刚"];
  }
  else if((temp = timeInterval/60) <60){
  result = [NSString stringWithFormat:@"%ld分钟前",temp];
  }

  else if((temp = timeInterval/(60*60)) <24){
  result = [NSString stringWithFormat:@"%ld小时前",temp];
  }

  else if((temp = timeInterval/(246060)) <30){
  result = [NSString stringWithFormat:@"%ld天前",temp];
  }

  else if((temp = timeInterval/(24606030)) <12){
  result = [NSString stringWithFormat:@"%ld月前",temp];
  }
  else{
  temp = timeInterval/(24606030*12);
  result = [NSString stringWithFormat:@"%ld年前",temp];
  }

  return result;
  }

时间相乘 ，显示错误❌－ － ！