Stealing Content? Changing Date?

Hi All,

I need some help. What keeps someone from stealing your content and using it for their own wordpress post and then changing the date for when the post was published (easily done from the wordpress post controls) so it looks like they were the first one to publish it? And if they do this, does this make Google think that they are the originators of the content?

The reason I ask is because I recently found content from my blog posted on someone else's blog. However, on my blog it was posted August 23, but on their blog it shows it was posted in June.

I know I'm the originator of the content because I wrote it myself. I didn't outsource it where an outsourcer might have copied it from someone else. But if you look at the dates, it makes it look like they published it first.

Is there a way to tell when Google first indexed the content from each place because if I wrote it first, then Google should of indexed it on my site first even if their post date is earlier.

So what do I do from here? Any suggestions?

Thanks.