DST Change Rules and GPW-1000
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Thread: DST Change Rules and GPW-1000

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  1. #1
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    DST Change Rules and GPW-1000

    It almost feels strange that there isn't a DST-related thread (at least not that I can see), and the DST ends in the EU (and some other European countries which follow the EU rules for DST) -- in less than half an hour.

    By now I already know that, the moment the hour strikes (one second after 01:59:59 BST), my GPW-1000 will change its time back to the "winter time" (01:00:00 UTC).

    This is different from the "normal" radio-controlled watches, which, at least in Europe, after the hour strikes and the time changes, will stay on the "wrong" time for about one minute, then they are scheduled to start an auto sync and upon a successful sync they set themselves to the correct time.

    My assumption is that, with GPW-1000, the information about the time change was not picked up from the radio signal (it is being transmitted in the radio signal for one hour just before the change) nor with the GPS signal (I don't think GPS signal even carries the information about DST), so, it will have some calendar with DST change rules built in itself?

    Now, my question is, what will happen if these rules ever change? I know a debate about this is always going on, and it might very well happen in future. What happens then, if and when the time isn't being changed any more? Will my watch (wrongly) change the time, then will auto sync with the radio signal and change itself back to the correct time?

    Also, it seems, that my watch after landing in a new EU time zone and after GPS-time-zone-sync might have the DST setting wrong so will I have to either (just after the GPS time zone sync) change the DST manually or to wait until the radio signal sync at night? (there is no manual radio sync, only manual GPS sync afaik, and this doesn't help with the DST setting as far as I understand)

    So it seems that we GPW-1000 owners should lobby against any possible DST changes -- no, the rules must stay as they are! :D

  2. #2
    Member yankeexpress's Avatar
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    Re: DST Change Rules and GPW-1000

    GPS has no DST as the satellites cannot possibly know which timezone every unit is in on earth.

    GPS transmits UTC and each unit adjusts for its time zone.

    Wait for the local radio sync, which does have DST in its code.
    Last edited by yankeexpress; October 29th, 2017 at 02:53.

  3. #3
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    Re: DST Change Rules and GPW-1000

    You will need a G such as GPW-2000 that allows you to update DST rules over Internet (via Bluetooth and mobile app).
    madman03 likes this.

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  5. #4
    CC
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    My MTG went straight to 1am as did the Bluetooth GST... The bluetooth isn't turned on my phone?
    AWG, GAW & GWG are looking to 'Receive'.
    Last edited by CC; October 29th, 2017 at 03:30.
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  6. #5
    Member Miklos86's Avatar
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    Re: DST Change Rules and GPW-1000

    In theory, the Multiband signal contains DST data. For Europe if the rules change I bet they will update the data.

    In theory. In reality, my Rangeman (synced on 2:05 am) duly left DST and now is on correct time. My GW5000-1JF, on the other hand, synced 1 hour later, at 3:04 and still is on DST, incorrectly. This is a riddle for me, I though the signal was the same for all watches.
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  7. #6
    Member GaryK30's Avatar
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    Re: DST Change Rules and GPW-1000

    Quote Originally Posted by Miklos86 View Post
    In theory, the Multiband signal contains DST data. For Europe if the rules change I bet they will update the data.

    In theory. In reality, my Rangeman (synced on 2:05 am) duly left DST and now is on correct time. My GW5000-1JF, on the other hand, synced 1 hour later, at 3:04 and still is on DST, incorrectly. This is a riddle for me, I though the signal was the same for all watches.
    Is the GW-5000 set to DST Auto or DST On?
    kubr1ck and madman03 like this.

  8. #7
    Member ocddave's Avatar
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    Re: DST Change Rules and GPW-1000

    Quote Originally Posted by yankeexpress View Post
    GPS has no DST as the satellites cannot possibly know which timezone every unit is in on earth.

    GPS transmits UTC and each unit adjusts for its time zone.

    Wait for the local radio sync, which does have DST in its code.
    Yes, but doesn't the GPS place where the watch is within whatever 500 meter squares it occupies? Thus setting the DST based on the the internal DST maps, but yes, if the DST rules change, game over. They really should of gave us the ability to change map settings for each of the time zones manually, and save that to the internal maps.

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  9. #8
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    Re: DST Change Rules and GPW-1000

    Quote Originally Posted by GaryK30 View Post
    Is the GW-5000 set to DST Auto or DST On?
    Oh. It was set to 'on'. Don't know, why, I was sure I set it to auto. Mystery solved, thank you.

    Now it's on auto, the DST got deactivated.
    Last edited by Miklos86; October 29th, 2017 at 11:24.
    - Casio G-Shock MR-G G1000B-1A
    - Casio G-Shock GW5000-1JF
    - Casio G-Shock Rangeman GW9400-1
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    Garmin Fenix 5 Plus
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