server time.cloudflare.com iburst nts
server nts1.time.nl iburst nts
server nts.netnod.se iburst nts
server ptbtime1.ptb.de iburst nts

minsources 2
authselectmode require

driftfile /var/lib/chrony/drift
ntsdumpdir /var/lib/chrony

leapsectz right/UTC
makestep 1.0 3

rtconutc
rtcsync

cmdport 0