ntpdate 1:4.2.8p4+dfsg-3ubuntu4 (armhf binary) in ubuntu xenial

 NTP, the Network Time Protocol, is used to keep computer clocks
 accurate by synchronizing them over the Internet or a local network,
 or by following an accurate hardware receiver that interprets GPS,
 DCF-77, NIST or similar time signals.
 .
 ntpdate is a simple NTP client that sets a system's clock to match
 the time obtained by communicating with one or more NTP servers. It
 is not sufficient, however, for maintaining an accurate clock in the
 long run. ntpdate by itself is useful for occasionally setting the
 time on machines that do not have full-time network access, such as
 laptops.
 .
 If the full NTP daemon from the package "ntp" is installed, then
 ntpdate is not necessary.