Ios笔记——> 未来时间与现在时间差

-(NSString *)time:(NSDate *)date
{
    NSDate * nowDate=[NSDate date];
    NSTimeZone *zone=[NSTimeZone systemTimeZone];
    nowDate=[nowDate dateByAddingTimeInterval:[zone secondsFromGMTForDate:nowDate]];
    double time=[date timeIntervalSinceReferenceDate]- [nowDate timeIntervalSinceReferenceDate];

    NSLog(@"time=%f",time);
    long long lTime=(long long)time;
    NSLog(@"long=%lld",lTime);//获取总秒
    NSInteger Seconds=lTime%60;//获取秒
    NSInteger Minutes=(lTime/60)%60;//获取分
    NSInteger Hours=(lTime/3600);//获取时
    NSInteger Days=0;//获取天
    if (Hours>24) {
        Hours-=24;
        Days=lTime/3600/24;
    }
    
    NSLog(@"%d天%d时%d分%d秒",Days,Hours,Minutes,Seconds);
    return [NSString stringWithFormat:@"%d天%d时%d分%d秒",Days,Hours,Minutes,Seconds];
}

根据网上一篇文章写的