Could switch over to NIST at time.nist.gov
See <a href="http:&#x2F;&#x2F;tf.nist.gov&#x2F;tf-cgi&#x2F;servers.cgi" rel="nofollow">http:&#x2F;&#x2F;tf.nist.gov&#x2F;tf-cgi&#x2F;servers.cgi</a> for info&#x2F;details<p>Granted that means trusting NIST over someone else.<p>The other options are getting time from a cellular modems, GPS or the most extreme running your own atomic clock.