In article <[email protected]>, "Richard B. Gilbert" <[email protected]> writes: >Rob wrote: >> Richard B. Gilbert <[email protected]> wrote: >>> Rob wrote: >>>> Richard B. Gilbert <[email protected]> wrote: >>>>> Rob wrote: >>>>>> Richard B. Gilbert <[email protected]> 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. >> There you go. It works for you, but it does not work in the general case. >I think it works for most people and places. Most of the US switches >to/from DST on the same day. I don't know about the rest of the western > hemisphere but since I seldom leave the continental U.S. it doesn't >really affect me very much. "works for most people" seems like a silly claim. What fraction of the world's population live in the US? (or within range of WWVB?) -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
