Hal Murray wrote: > In article <zu2dnetyfmcp4atxnz2dnuvz_hodn...@giganews.com>, > "Richard B. Gilbert" <rgilber...@comcast.net> writes: >> Rob wrote: >>> Richard B. Gilbert <rgilber...@comcast.net> wrote: >>>> Rob wrote: >>>>> Richard B. Gilbert <rgilber...@comcast.net> wrote: >>>>>> Rob wrote: >>>>>>> Richard B. Gilbert <rgilber...@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.
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