/**
 *  計算剩餘時間
 *
 *  @param endTime   結束日期
 *
 *  @return 剩餘時間
 */
-(NSString *)getCountDownStringWithEndTime:(NSString *)endTime {

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm"];

    NSDate *now = [NSDate date];
    NSTimeZone
 
 *zone = [NSTimeZone systemTimeZone];//設定時區
    NSInteger interval = [zone secondsFromGMTForDate: now];
    NSDate *localDate = [now  dateByAddingTimeInterval: interval];
    endTime = [NSString stringWithFormat:@"%@ 23:59", endTime];
    NSDate *endDate = [dateFormatter dateFromString:endTime];
    NSInteger
 
 endInterval = [zone secondsFromGMTForDate: endDate];
    NSDate *end = [endDate dateByAddingTimeInterval: endInterval];
    NSUInteger voteCountTime = ([end timeIntervalSinceDate:localDate]) / 3600 / 24;

     NSString *timeStr = [NSString stringWithFormat:@"%d", voteCountTime];

    return timeStr;
}