ntpdate-debian - set the date and time via NTP
ntpdate-debian [-bBdoqsuv] [-a key] [-e authdelay] [-k keyfile] [-o
version] [-p samples] [-t timeout]
ntpdate-debian is identical to ntpdate(8) except that it uses the
configuration in /etc/default/ntpdate by default. ntpdate sets the
local date and time by polling Network Time Protocol (NTP) servers.
ntpdate-debian(8)