How to find first cached date and time of a website?

Posted by John Sanjay on Pro Webmasters See other posts from Pro Webmasters or by John Sanjay
Published on 2013-06-26T09:03:03Z Indexed on 2013/06/26 10:28 UTC
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I found some of my webpage contents has been copied in other website. I need to check the cache date and time of both pages so that i can compare and guess which page is original and which one is duplicate according to Google. Because i know that if Google found two webpages with same content, it consider the first cached page by Google bot as unique.

Is there any online tool for checking that? or other ways?

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