I have a situation that I do not fully understand, related to syndicated content. My site - where the original version of my articles is being published, is being seen by google not as the original/canonical version. Instead, the site that is syndicating the content is seen as the original version. This doesn't look to be a simple case of both versions are valid, but the syndicated site is just better promoted, but that it's actually the original version, for several articles. For example:

• my article: http://www.baeldung.com/spring-security-login
  
• the syndicated article: http://www.javacodegeeks.com/2013/05/spring-security-login.html
  
• the search: https://www.google.com/search?q=+spring+security+login
  The syndicated version is on 3rd place, my own content doesn't appear in the first 100 results.

The site that syndicates my content does have a link back to my article; it also has the date on the article page, but it looks like this is the updated date, not the published date:
<span class="date updated">May 7th, 2013</span>

On my site, the date looks like this: <abbr title="2013-05-01T16:13:14+0000" class="date time published">May 1, 2013</abbr>

Should the syndicating site also use proper timestamps and a publish date? Can this be the reason google picks it up as the original version?
Also, is there any way to fix this problem?

Thanks.
Eugen.