cheat-fork-echo/cheat/cheatsheets/ntp

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# Verify ntpd running:
service ntp status
# Start ntpd if not running:
service ntp start
# Display current hardware clock value:
sudo hwclock -r
# Apply system time to hardware time:
sudo hwclock --systohc
# Apply hardware time to system time:
sudo hwclock --hctosys
# Set hwclock to local time:
sudo hwclock --localtime
# Set hwclock to UTC:
sudo hwclock --utc
# Set hwclock manually:
sudo hwclock --set --date="8/10/15 13:10:05"
# Query surrounding stratum time servers
ntpq -pn
# Config file:
/etc/ntp.conf
# Driftfile:
location of "drift" of your system clock compared to ntp servers
/var/lib/ntp/ntp.drift