Changed On Cached Date on Google - From August 15 to August 14

[francesca]

I made some changes on my site on the 15th of August and the changes was already cached in google that same day. So the date that was showing on August 15 for the cache was also August 15.

Today is the 16th but the cache and date that is showing is for 14th of August. I just think that this is weird that the results displayed yesterday were very fresh but now it is showing an older cache date.

Do you have any explanation for this?

By the way, im still a new poster here in Webmaster World but I have been lurking for a while. This is really a great forum and I have learned a LOT! Thanks to all your posts.

[ciml]

Welcome to WebmasterWorld, francesca.

Google have a number of datacentres, any of which can supply your results from one minute to the next. As they're not all updated simultaneously, you can see older results after newer.

As a webmaster trying to keep track of Google, this can be a little frustrating for some people, but Google's processes allow them to search billions of URLs in well under a second and keep very recent information for a large number of URLs.

[francesca]

Thanks for the answer and the welcome! I think I will just lessen my keeping track of the serps(if I can). I love Google but the unstable results lately makes me want to check all the time if everything is ok again.

[g1smd]

A search at www pulls a search result from a random datacentre each time, additional pages of the same search usually come from the same datacentre if done soon after the original search though.

The ten datacentres are www-fi, -in, -va, -ab, -dc, -cw, -ex, -zu, -sj, and the new one at -gv.

For each www-xx there is also a www-xx2 datacentre.

A search at www2 or www3 pulls from a fixed datacentre. Google moves these pointers around to point to different datacentres from time to time.