Quoting richard lucassen (mailinglists@???):

> Yes and no:
>

> -n  Use SNTP (old RFC 2030, currently RFC 5905) instead of  the  RFC
>     868 time protocol.

>
> # rdate -n ntp.xs4all.nl
> Fri Jun 12 12:07:04 CEST 2020

Point taken. SNTP _is_ worthy of respect -- but I'd personally rather
have and use full NTP tools, and, given that the later are around and
standard, I don't also need one that does just SNTP (or that plus RFC
868 Time Protocol).