To help you with some more alternatives, here are the sites that I use for that:
Time Servers
Protocol is SNTP and prot number is 123 for all these:
time.ucla.edu
tick.ucla.edu
montpelier.caltech.edu
tock.usnogps.navy.mil
ntp-2.mcs.anl.gov
ntp.nasa.gov
Here are some more, for reference, although I don't use these:
clock.isc.org (Palo Alto, CA)
clock.sgi.com (Mountain View, CA)
clock.via.net (Palo Alto, CA))
gpstime.trimble.com (Sunnyvale, CA)
montpelier.ilan.caltech.edu (California Institute of Technology, Pasadena, CA)
nist1.aol-ca.truetime.com (Sunnyvale, California)
nist1.datum.com (San Jose, California)
nist1-sj.glassey.com (San Jose, California)
ntp-cup.external.hp.com (Cupertino CA)
ntp.nasa.gov (NASA Ames Research Center, Moffett Field, CA)
tick.gpsclock.com (Redondo Beach, CA)
timekeeper.isi.edu (USC Information Sciences Institute, Marina del Rey, CA)
tock.gpsclock.com (Redondo Beach, CA)
usno.pa-x.dec.com (Palo Alto, CA)
navobs1.usnogps.navy.mil (Falcon AFB, Colorado)
navobs2.usnogps.navy.mil (Colorado)
time-a.timefreq.bldrdoc.gov (NIST Boulder Laboratories, Boulder, Colorado)
time-b.timefreq.bldrdoc.gov (ditto)
time-c.timefreq.bldrdoc.gov (ditto)
time-d.timefreq.bldrdoc.gov (ditto)
time.nist.gov National Center for Atmospheric Research, Boulder, Colorado)
Search out sites physically close to you & use those. Nearby universities, military or NOAA places, etc. Time's a-wastin!