Can scholars conclusively say when 1 Corinthians was written? Even if it were written during the same time the events of Acts were unfolding (which I highly doubt), why give spiritual gifts so much focus, considering they would no longer be employed at the closing of the Canon? Remember that some dates we have for when biblical books were written are only speculative, as those dates are based off the oldest letters of antiquity known to exist, not the autographs.