Webmasters Tools Structured Data Issue with Contango

Hi! My issue is with a client’s blog using the theme Contango. Using Google Webmasters Tools > Search Appearance > Structured Data we noticed a lot of “hentry” errors.

The errors the client’s blog is receiving are:

Missing: author
Missing: updated

I have researched the “Missing: updated” issue and it seems to be an issue with certain WordPress theme’s code. A few websites suggest adding “updated” after “entry-date” in the code:

Current code:
$date = sprintf( ‘<time class=”entry-date” datetime=”%3$s”>%4$s</time>‘,

Change to:
$date = sprintf( ‘<time class=”entry-date updated” datetime=”%3$s”>%4$s</time>‘,

I would have no problem doing this, however I’m not actually sure where to find that code or if that does in fact work for the Contango theme?

I haven’t yet researched the “Missing: author” error yet, but I assume this is something to do with the author tag and a Google + account?

Any answers or guidance on these 2 issues would be much appreciated!

Thanks in advance.