Linux Notes: Never be late with htpdate
htpdate is a free software licensed under GPL that synchronizes your computer's time using the HTTP Time Protocol (HTP). It's an alternative to ntpdate in situations where ntp port is being blocked by the network.
This video demonstrates how to install htpdate on a Raspberry Pi and examine its basic usage and the solution to its usual problem.
➤ References:
http://www.vervest.org/htp/
https://directory.fsf.org/wiki/Htpdate