[time-nuts] More ES100 WWVB Measurements

[Graham / KE9H]

> Does anybody know how many other places use the same rules?  What does
Canada do?

https://en.wikipedia.org/wiki/Daylight_saving_time_by_country

--- Graham

==

On Tue, Jan 1, 2019 at 4:05 PM Hal Murray <hmurray at megapathdsl.net> wrote:

>
> > GPS has no bits for Daylight Savings.  As far as I know only WWV and WWVB
> > have those bits. So for a clock displaying local time WWVB is the way to
> go.
>
> WWVB's DST data is targeted at the US.
>
> Does anybody know how many other places use the same rules?  What does
> Canada
> do?
>
> Has anybody looked into how much code it takes to implement DST?  If you
> are
> willing to stick to one set of rules, you could pre-compute a small table
> to
> cover the next 20 (or 100) years.  That's probably not good enough for a
> product, but OK for most home brew clocks.  Can I get to 2100 with only 28
> slots?  (7 for day-of-week, and 4 for leap years)
>
> The full Unix time conversion package is pretty big if you are of running
> it
> on a tiny SOC.  Has anybody implemented a slimmed down version?  How slim
> can
> you get if all you want is DST?
>
> Besides, GPS gives you leap second warning.
>
> A while ago, somebody asked why use WWVB rather than GPS?  One answer is
> so we
> can monitor what it does when a leap second happens.
>
>
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
>
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