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Man Pages


Manual Reference Pages  -  SNTPCLOCK (1)

NAME

sntpclock - check a system’s clock through NTP

CONTENTS

Synopsis
Description
Notes

SYNOPSIS

sntpclock host

DESCRIPTION

sntpclock connects to an NTP server on host. host must be a dotted-decimal IP address.

sntpclock prints a 16-byte TAI64NA adjustment that, when added to the local UNIX clock, will produce the TAI clock on host. sntpclock limits the adjustment to 2 days.

sntpclock does not bind to port 123; this means that it does not need to run as root. Note that some firewalls will not permit sntpclock requests.

NOTES

An NTP timestamp is a count of non-leap seconds. sntpclock uses a local leap-second table to convert the NTP timestamp to TAI with an epoch of 1970-01-01 00:00:10 TAI. For a discussion of the difference between UTC and TAI see http://pobox.com/~djb/proto/utctai.html.

The current NTP time scale will break down in 2036.

SEE ALSO

clockspeed(1), clockadd(1), clockview(1), taiclock(1), leapsecs(3), xntpd(8)
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