Ntpdate

ntpdate is a computer program used to quickly synchronize and set computers' date and time by querying a Network Time Protocol (NTP) server. It is available for a wide variety of unix-like operating systems.

The accuracy and reliability of  entirely depends on the accuracy and network link stability of the first server it connects with. As this inaccuracy can lead to a multitude of problems, the maintainers have decided to deprecate it in favor of only using the  (network time protocol daemon) or a   (simple network time protocol) query.