NTP
config file:
/etc/ntp.conf server 0.pool.ntp.org server 1.pool.ntp.org server 2.pool.ntp.org server 3.pool.ntp.org driftfile /var/lib/ntp/ntp.drift restrict default nomodify nopeer restrict 127.0.0.1
set:
ntpdate 0.pool.ntp.org
check:
timedatectl
sync to hw:
hwclock --systohc