Netclock is a very simple command line tool for querying ntp and comparing the result with the system time.
Uses pool.ntp.org as a time server.
$ npm install netclock
$ netclock
____________________________________________________
System time : Wed Sep 09 2015 17:51:15 GMT+0100 (IST)
Network time : Wed Sep 09 2015 17:51:33 GMT+0100 (IST)
____________________________________________________
MIT License (MIT)