The ntpdate utility is deprecated (though still available via apt get install in Debian Jessie). To sync local clock without ntpdate:
sudo systemctl stop ntp
sudo ntpd -gq
sudo systemctl start ntp
The list of time servers to use is usually in /etc/ntp.conf (for the Beaglebone Jessie console image and Ubuntu server 16.04.2 LTS).
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UHCM-specific:
NTP using public time servers doesn't work when using the UHM/SOEST network. Add server ntp.soest.hawaii.edu to /etc/ntp.conf to fix this.
