RSS Graffiti works pretty good for this, but it needs you to have the datestamp following the RFC-822 format, which isn't default for vBulletin.
You need to go to the AdminCP > Settings and set the timestamp to this, I have been having issues setting everything properly; yet I'll leave you here some examples of this standard:
Wed, 02 Oct 2002 08:00:00 EST
Wed, 02 Oct 2002 13:00:00 GMT
Wed, 02 Oct 2002 15:00:00 +0200
That's how date-time must be shown on your site in order to follow this standard.
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