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HTP (HTTP Time Protocol) is an alternative way of getting "good enough" synchronized time. htpdate will give you near-second accuracy.
It works where NTP/SNTP does not because of firewalls and proxies. Of course, if NTP/SNTP can be used, use that instead.
htp is not in Ubuntu!
There are 5 alternatives - vote for the best!
If you can do better, submit your command here.
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