Well, then my clock (and perhaps others) is being lazy about interpreting the bits. If it looks at the left bit only, then that would explain early transitions. The other possibility is misreading the right hand bit as being a 1 during one reading and deciding that it had “missed” the change somehow.
> On Mar 13, 2016, at 9:38 PM, Tom Van Baak <[email protected]> wrote: > > Hi Andy, > > No, there's nothing about 0200Z. Correct, WWVB doesn't know your local zone. > > WWVB itself doesn't "switch" to/from DST. It always only transmits UTC. It is > up to your receiver-clock to translate UTC to local time for the user > display. This is why most of WWVB radio controlled clocks have a little PMCE > (Pacific / Mountain / Central / Eastern) switch. > > The WWVB data format also includes bits which announce if DST change will > occur. It is up to the receiver-clock to decode these bits and make the 1 > hour adjustment at the appropriate time (usually 2 am local time). > > See also: > https://en.wikipedia.org/wiki/WWVB > http://tf.nist.gov/general/pdf/2422.pdf > http://www.nist.gov/pml/div688/grp40/radioclocks.cfm > > /tvb > > ----- Original Message ----- > From: "Andy" <[email protected]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Sent: Sunday, March 13, 2016 7:21 PM > Subject: Re: [time-nuts] When does NIST change to DST? > > >> I wonder if WWVB switches to DST around 0200Z, maybe? Since it can't >> tell where your local zone is. >> >> Andy >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
