How to set High Sierra clock manually from an NTP server?

I'm running High Sierra because High Sierra is as recent as this old iMac will ever be. El Capitan kept time just fine. Since High Sierra the clock is consistently 2 minutes slow. I've got a phone and a table keeping identical time that are 2 minutes faster than the iMac. I see that this is a known problem. Changing System Preferences automatic timekeeping doesn't reset the clock. I specify NTP time servers but they don't set the clock. Is there a separate app that acts as a timekeeping daemon? Can I just run something from a terminal command line every so often that will set the clock? There are many answers to this out there but not one I've seen that I can do without installing C and compiling an app. That's not going to happen. Thank you, signed Mike "wondering why every OS upgrade introduces more bugs than it fixes and we're all supposed to clap louder."