search site:yd631.com/blog and you found a date in serp(#1 spot), if you take a look at the cache ,you will found - This is G o o g l e's cache of http://www.yd631.com/blog/ as retrieved on 10 May 2007 06:56:37 GMT they are different date, why?
bez these date refer to the same thing: the lastest cache time. by Fabian.JH reminder,I think it should be timezone problem
i think google get the cache after some time from the crawling. i see 1 day difference for your example