[ntp:questions] Can or should the NTP protocol eventually serve timezone data?

Richard B. Gilbert rgilbert88 at comcast.net
Fri Jun 19 11:16:27 UTC 2009


Hal Murray wrote:
> In article <Zu2dneTYfMCP4aTXnZ2dnUVZ_hOdnZ2d at giganews.com>,
>  "Richard B. Gilbert" <rgilbert88 at comcast.net> writes:
>> Rob wrote:
>>> Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>>>> Rob wrote:
>>>>> Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>>>>>> Rob wrote:
>>>>>>> Richard B. Gilbert <rgilbert88 at comcast.net> wrote:
>>>>>>>> I believe that the O/S vendors supply a file with timezone data.  If you 
>>>>>>>> have support, you can even get updates from the vendor.  Since I can't 
>>>>>>>> afford support (I'm retired and a hobbyist) I have to do it by hand.
>>>>>>> As Jan Ceuleers also pointed out, the problem is not at all limited
>>>>>>> to operating systems.  Any device that obtains time using NTP and wants
>>>>>>> to display it in local time needs the info.
>>>>>>> This could just as well be a digital clock.
>>>>>> I have a couple of "radio controlled" digital clocks and a wrist watch 
>>>>>> that do it automagically.  The VLF broadcast from WWVB provides the 
>>>>>> necessary info.
>>>>> That cannot be true.  It may work for your location, but I'm sure it
>>>>> does not cover the general case under discussion.
>>>> How can it not be true?  The time broadcast encodes both the time 
>>>> (standard time) and whether or not DST is in effect.  Of course it 
>>>> doesn't work for those jurisdictions that have chosen to go there own 
>>>> way as far as DST is concerned.
> 
> "Standard time" (if you mean EST, PST...) doesn't make much
> sense on a signal that covers many time zones.
> 
> I'm pretty sure WWVB transmits UTC.  You have to tell your clock
> or watch the local time zone.  After that, it will do the 1 hour
> offset in the spring/fall.  It will be a day or more late if
> reception is poor on the magic night.
> 
WWVB does transmit UTC!  The clocks have provision for setting the time 
zone.

<snip>




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