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Another DST fiasco coming up?

Discussion in 'Electronic Design' started by Al, Mar 12, 2007.

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  1. Al

    Al Guest

    So, I suppose quite a few people have manually changed the clocks on
    their devices to comply with the new DST changeover time.

    Now, tell me what will happen when all those devices automatically
    advance their clocks 1 hr in three weeks? Will all those people have to
    now set their clocks back an hour?

  2. Al,

    Unless the devices have a way for the user to configure the start and
    end of DST or a way of being "upgraded", that is exactly what will

    And since Congress decided to change when DST ends, the times will need
    to corrected in October and November as well.
  3. And all based on 3 decades old data.
  4. Jim Thompson

    Jim Thompson Guest

    Your VCR may actually have that feature, just read the manual.

    Most, but not all, PBS stations have the correct time in the
    vertical-blanking interval, and many VCR's utilize that information.

    You just need to designate which channel is PBS (in the set-ups) for
    it to work.

    ...Jim Thompson
  5. Dave Pollum

    Dave Pollum Guest

    I manually adjusted my PC's time, but until I read your post, I hadn't
    even thought about my Win2K PC adjusting the time again in 3 weeks. I
    just unchecked the "Automatically adjust clock for daylight savings
    time" box, so I shouldn't have that problem.
    -Dave Pollum
  6. JeffM

    JeffM Guest

    Got a ferinstance of a *device* that does this?

    Even the most ancient of computer OSes which have a DST feature
    have patches available.

    As Thompson noted, a VCR that auto-sets its time
    gets the data from the blanking interval.

    I heard there is an interesting phenomena
    where folks who live on the edge of a DST/non-DST area
    change the channels on their VCR
    and have the clock change back & forth.
  7. Dave,

    Check the following site for a Win2K fix that allows you to set when DST
    begins and ends? Worked great on mine.
  8. Joerg

    Joerg Guest

    Yes, we realized that yesterday with our VCR. What a mess. If at least
    the technology would have the smarts to sponge the actual time off some
    info in the V-sync data packets but AFAIR that got botched pretty good.
  9. Apparently some of the PBS channels broadcast not only this but also program
    information for all channels.

    See the Hauppauge manual on how to configure and get this info on your
    computer. However the low ball TVs and VCRs in the US won't access this
  10. Joerg

    Joerg Guest

    I did. Our Panasonic Omnivision PV-7453 does not have that feature. Oh
    well, I'll just turn the DST flag to off and it won't auto-change anymore.

    I'll have to say, that VCR stuff is one of the things that was more
    modern in Europe. At least in Germany. There, the remote had a built-in
    barcode reader. All the movies and pretty much any other important
    broadcast had a bar code next to it in the papers. Zzzip ... beep and it
    shows up in the little LCD. Check that you didn't accidentally scan the
    horror movie below it, hit "send", another beep and ... done. No need to
    give it an extra half hour in case so-and-so can't stop babbling or some
    soccer game went into overtime. Because then this bar code would be
    matched against a movie ID in the V-sync so the VCR won't start
    recording before that movie really shows up. Of course, if someone
    wanted to tape that soccer game this technology would make sure that it
    won't stop recording until the referee blew the whistle for the last
    time. And all this was 15 years ago.

    I wish. And I'll never understand why they can't read time
    automatically. Why can't it just scan all channels and figure out which
    is PBS? In this day and age that ain't rocket science no more. Or pick
    up WWVB. Or whatever. In med electronics they expect a whole lot more
    creativity out of us consultants, and rightfully so. <shaking head>
  11. Rich Grise

    Rich Grise Guest

    Oddly, when I came in this morning, the WWV clock was still on last
    night's time, but all of the computers in my office had changed their

    But Doze probably got it from home, and I've got the Linux boxen on
    NTPD. :)

  12. Joerg

    Joerg Guest

    Which is kind of strange, considering that the 15+ year old Blaupunkt
    VCR did that and our newer Panasonic doesn't. When I cleaned that
    Blaupunkt the inside sure looked like Panasonic to me.
  13. Jim Thompson

    Jim Thompson Guest

    My old Panasonic was so heavy it took two people to carry it.

    ...Jim Thompson
  14. My last Sanyo is so small and light I can lift it with a little finger.
  15. Hmm. I'm not sure how Windows works. But with systems that are
    DST-aware, I'd think that you'd want to change the DST start an end
    times and not actually monkey with the clock.

    Unix systems actually track everything in UTC, which should never be
    bumped forwards or backwards. The timezone functions only serve to
    modify the displayed value of time.
  16. From data transmitted in the blanking interval by the local station or
    network that is. For an example of how well they keep their clocks
    updated, I started scrolling through the HDTV program guides. The error
    in station times ranges from 17 minutes slow, through one hour off
    (those that haven't switched to DST) to 3 days slow. A few months ago,
    one of the stations displayed a date some time in May as I recall.
    If you are counting on the station techs to keep their clocks up to
    date, good luck. You'd be better off with a VCR blinking "12:00". At
    least its right twice a day.
  17. DTV broadcasts have this data (mostly).
  18. Jim Thompson

    Jim Thompson Guest

    Doesn't that bug you? My PC's are synced to NIST, yet the TV behind
    me will start a new program a good two minutes before the hour.
    That's what I do. But then I don't use a VCR often enough to care. I
    started to tape a show the other day only to find that the transport
    mechanism had frozen up through disuse :-(

    ...Jim Thompson
  19. JeffM

    JeffM Guest

    This is not a user option in Windoze.
    You apply the available patches or you reset by hand.
    The only option is a tickbox for Use/Don't use DST.
    I was under the impression that's how everybody does it.
  20. Joerg

    Joerg Guest

    I would sure hope so. Problem is, VCRs don't understand DTV and this
    whole digital TV is far off for people like us. When I checked a month
    ago there may be about three digital channels we could possibly receive
    unless multipath thwarts that. In contrast to a dozen+ analog stations.
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