iOS-获取两个日期的差值判断是否大于半年

最新推荐文章于 2021-12-10 11:36:48 发布

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最新推荐文章于 2021-12-10 11:36:48 发布

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分类专栏： iOS

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本文介绍了两种方法来判断XML文件是否已超过半年未更新，从而决定是否需要删除。通过NSDateFormatter将日期字符串转换为NSDate对象，并计算两个日期之间的间隔。

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有两种方式可以实现

方式一：


    // 统一格式
    NSDateFormatter *formater = [[NSDateFormatter alloc] init];
    [formater setDateFormat:@"yyyy-MM-dd HH:mm"];
        // create
    NSArray *createTimeArray = [createDate componentsSeparatedByString:@"."];
    createDate = [createTimeArray objectAtIndex:0];
    NSDate *newCreateDate = [formater dateFromString:createDate];
    NSTimeInterval createInterval = [newCreateDate timeIntervalSince1970] * 1;
    // now
    NSArray *nowTimeArray = [nowDate componentsSeparatedByString:@"."];
    nowDate = [nowTimeArray objectAtIndex:0];
    NSDate *newNowDate = [formater dateFromString:nowDate];
    NSTimeInterval nowInterval = [newNowDate timeIntervalSince1970] * 1;
    // 得到的时间差是秒数
    NSTimeInterval timeDifference = nowInterval - createInterval;
    float halfYear = [[NSNumber numberWithInt: kTVUHalfAYearInSeconds] floatValue];
    
    NSLog(@"Jenny 1017 000  创建日期：%@\n 现在的日期：%@\n 中间的差值：%f\n",newCreateDate,newNowDate,timeDifference);
    if (timeDifference - halfYear >= 0.000001) {
        NSLog(@"The XML file was created for a distance of more than half a year and need to be deleted\n createDate:%@",createDate);
        return YES;//  需要删除
    }else{
         NSLog(@"The XML file is created less than half a year and does not need to be deleted\n createDate:%@",createDate);
        return NO;//不需要删除
    }

方式二：


    // 统一格式
    NSDateFormatter *formater = [[NSDateFormatter alloc] init];
    [formater setDateFormat:@"yyyy-MM-dd HH:mm"];
        NSDate *create = [formater dateFromString:createDate];
        NSDate *now = [formater dateFromString:nowDate];
        NSTimeInterval timeDifference = [now timeIntervalSinceDate:create];
        float halfYear = [[NSNumber numberWithInt: kTVUHalfAYearInSeconds] floatValue];
        NSLog(@"Jenny 1017  创建日期：%@\n 现在的日期：%@\n 中间的差值：%f\n",create,now,timeDifference);
        if (timeDifference - halfYear >= 0.000001) {
            NSLog(@"The XML file was created for a distance of more than half a year and need to be deleted\n createDate:%@",create);
            return YES;//  需要删除
        }else{
            NSLog(@"The XML file is created less than half a year and does not need to be deleted\n createDate:%@",create);
            return NO;//不需要删除
        }