title: How to make `aws s3 sync` ignore size and only use last modified time
body: <p>Is there a way to make <code>aws s3 sync</code> only use <strong>last modified time</strong>?<br>
  i.e., even if file sizes differ, only copy if source is newer than destination</p>
  
  <p>If not, is there an easy workaround to get this behaviour?</p>
  
  <p>Thanks</p>