从站点抓取链接

我有一个问题。我想从一个网站抓取链接(示例:www.x.com/date/counter of news)。现在，我的解决方案是:

1-我有最新链接，存储在我的数据库中，如下所示:
www.x.com/2015/01/13/99901

2-我得到最新链接从网站，像下面:
www.x.com/2015/01/12/99905

3-我想循环之间99901 ~ 99905为生成以上两个链接之间的链接，如下所示:

www.x.com/2015/01/12/99901
www.x.com/2015/01/_( I don't know this day is /12 or /13 )_/99902
www.x.com/2015/01/_( I don't know this day is /12 or /13 )_/99903
www.x.com/2015/01/_( I don't know this day is /12 or /13 )_/99904
www.x.com/2015/01/13/99905

现在，我知道日期什么时候改变了?!!