Hi,


rdate is ther by defoult on openwrt 10.03


rdate
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On Unix-like operating systems, rdate is a tool for querying the
current time from a network server and, optionally, setting the system
time. Rdate uses the Time Protocol. The Time Protocol is generally
considered obsolete and has been replaced by the Network Time Protocol
(NTP).

When used to set the local system time, rdate operates by changing
system time immediately to the time and date returned by the server.
Abrupt changes of clock settings have been found to cause problems for
software relying on timing. This led to the development of the Network
Time Protocol, which gradually changes the system time and does not
skip ticks.

Due to the problems described above, rdate is generally used only on
systems where NTP is not available, or in specialized circumstances
where it is required that system time be set correctly as soon as
possible during initial setup, before services which may be vulnerable
to abrupt time-changes have started.



RDATE command, update you DATE and TIME from NTP

RDATE retrieves the date and time from another machine on your
network, using the RFC 868 protocol. If you run rdate as root, it will
set your machine's local time to the time of the machine that you
queried.
This feature was included from release 1.3.4.

This feature is available on foXServe, as BUILT-IN command.


the command syntax is as follow:

rdate -t 4 -s NTP_SERVER

The command automatically adjust your system clock to the value
provided by the network time server

for example:
rdate -t 4 -s 129.6.15.28

A list of Nework Time servers is available on:
http://ntp.isc.org/bin/view/Servers/WebHome

If you would like to set automatically the time on startup you have
just to follow the how to on this link:
http://www.acmesystems.it/?id=57#10000 and use the following line
instead of testprog.out

/bin/rdate -t 4 -s NTP_SERVER



rdate
rdate [options] [host...]

TCP/IP command. Retrieve the date and time from a host or hosts on the
network and optionally set the local system time.

Options
-l
Send errors and output to syslogd.

-p
Print the retrieved dates.

-s
Set the local system time from the host; must be specified by root.

-t n
Timeout each retrieval attempt after n seconds.

-u
Use UDP instead of TCP.
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