Could switch over to NIST at time.nist.gov See http://tf.nist.gov/tf-cgi/servers.cgi http://tf.nist.gov/tf-cgi/servers.cgi for info/details Granted that means

Could switch over to NIST at time.nist.gov See http://tf.nist.gov/tf-cgi/servers.cgi http://tf.nist.gov/tf-cgi/servers.cgi for info/details Granted that means trusting NIST over someone else. The other options are getting time from a cellular modems, GPS or the most extreme running your own atomic clock.