I have re-packaged the Debian version of the 'rdate' program for OS2007. You can use it to set the clock on the N800 from a reference time server computer, using either the RFC868 time protocol or SNTP.

It works similar to e.g 'ntpdate', although they don't always work against the same computers.

To just check your clock against a server, use -p -v:
>rdate -p -v -n time.nist.gov
Tue Oct 30 17:59:39 MET 2007
rdate: adjust local clock by 2.046977 seconds

>rdate -p -v time-b.timefreq.bldrdoc.gov
Tue Oct 30 18:00:56 MET 2007
rdate: adjust local clock by 2 seconds

The above "-p print only" commands can be run as user. To set the clock (i.e. running without -p or with -s) you need to be root.

Note that time.nist.gov appears to support only SNTP (thus the -n), while the other one supports RFC868. (If you look at nist's website you should find a whole bunch of other reference time servers).

Very often you can also get rdate working against a local computer in your network if that one's got correct time by other means. Particularly if that computer happens to be a Unix- or Linux computer:
>rdate local-computer.your.net

The above example output was from my desktop computer. When I did the same on the N800 it was only 3 seconds off.. and I haven't adjusted the time in weeks, possibly months (I set it manually, but accurately at the time). So the N800 clock seems to be _very_ accurate, unless I got lucky for some reason. But this means that you won't have to constantly monitor and set the N800 clock, which means that it's not a problem that there's no 'cron' on the N800, and it also means that there's not much point in installing the whole 'ntp' suite, for example.

Where to find it:
http://www.box.net/shared/zaj5id7dau
(click the link and you'll see the .deb, together with some other stuff.)
Note that box.net's server doesn't set the necessary Content-Type, so if you use the N800 browser it won't automatically understand that it can be installed. You'll have to download it first.
But, as this program is _really tiny_ I'll attach it here as well: The .deb is 9KB while the installed program is only 16KB.

TA-T3