I have an HTML 5 document containing the element:

<time datetime='2013-04-18T12:57:59+01:00' pubdate='pubdate'>Thu, 18 Apr 2013 at 0:57PM</time>

This doesn't validate. The error is

Attribute pubdate not allowed on element time at this point.

Any idea how to correct this validation error?

html w3c-validation
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