server 0.us.pool.ntp.org iburst
server 1.us.pool.ntp.org iburst
server 2.us.pool.ntp.org iburst
server 3.us.pool.ntp.org iburst
driftfile /var/lib/chrony.drift
leapsectz right/UTC
makestep 1.0 3
rtconutc
rtcsync