How can I keep my system clock in sync under Mavericks?
these seem to work ok on my iMac, running Mountain Lion:


  0.pool.ntp.org 1.pool.ntp.org 2.pool.ntp.org 3.pool.ntp.org time.apple.com


simply copy/paste the space-separated line above into the ’Set date and time automatically’ field, in Date &amp; Time preferences. remember to press Enter after typing the ntp server names, so that ntp.conf gets updated.