https://gitlab.com/NTPsec/ntpsec/commit/0a2bb57e7c0b13c9f54150773b8798102f4b593d

Thu Aug 9 13:24:33 UTC 2018

It looks like that particular section of code dates back at least 19 years.
It's in ntpd/ntp_util.c:54 grep also reveals that it is in the
documentation for ntpd.
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