I was indulging in a bit of hyperbole. My point is despite his proto or nascent Sabbatarianism, to use Lauer's term, Calvin would be pretty much in the strict WCF camp.
I've never seen nor heard of a candidate being turned down in the PCA because they were a strict Sabbatarian or because they took no exceptions to the Standards. I took no exceptions to the Standards when I was being examined and my presbytery had no problem with that.