ntp
/usr/sbin/ntpdate us.pool.ntp.org
# ntpdate -q us.pool.ntp.org
server 104.131.53.252, stratum 2, offset -0.035291, delay 0.24318
server 104.236.116.147, stratum 2, offset -0.029536, delay 0.25540
server 216.229.0.50, stratum 3, offset -0.039611, delay 0.25568
server 45.79.11.217, stratum 2, offset -0.030882, delay 0.21490
4 Nov 13:29:44 ntpdate[23518]: adjust time server 45.79.11.217 offset -0.030882 sec