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  1. #1
    Moderator German Watches Forum
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    time change

    One feature of having your watch coupled to the cellular network
    is local time being frequently updated. The "watch" function tracks
    the local time and updates from the network. Days like today when
    the time changes in most of the US you don't need to do a reset.
    Indeed the smart watch reminds you it is time to reset your
    traditional clocks and watches to stay in sync with the world.


    Thanks,
    rationaltime

  2. #2
    Member BarracksSi's Avatar
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    Re: time change

    Assuming the OS doesn't have a bug preventing a proper time update (happened just once or twice for some iPhone owners over the years, but it's happened).

    Still, my AW was correct Sunday morning, while my two radio-synced quartz watches hadn't received a signal overnight and needed me to adjust them manually.

  3. #3
    Member Sheldon John Clark James's Avatar
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    Re: time change

    :P
    Visman likes this.
    Instagram@sheldinkee

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  5. #4
    HAQ and AW moderator
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    Re: time change

    Thatvl is a benefit of a watch slaved to a reliable network. Hope yo find out soon before the leep second hits.

  6. #5
    Member BarracksSi's Avatar
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    Re: time change

    Quote Originally Posted by ronalddheld View Post
    Thatvl is a benefit of a watch slaved to a reliable network. Hope yo find out soon before the leep second hits.
    Cellular networks aren't known for timekeeping reliability (as unbelievable as it sounds). Apple avoids them by maintaining its own internet-accessed time servers -- I think they have three around the world -- and references them to the atomic clocks.

    This was an earlier thread; the linked article has a lot more detail:
    https://forums.watchuseek.com/f586/ap...l-2725905.html
    Chibatastic likes this.

  7. #6
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    Re: time change

    Quote Originally Posted by BarracksSi View Post
    Cellular networks aren't known for timekeeping reliability (as unbelievable as it sounds). Apple avoids them by maintaining its own internet-accessed time servers -- I think they have three around the world -- and references them to the atomic clocks.

    This was an earlier thread; the linked article has a lot more detail:
    https://forums.watchuseek.com/f586/ap...l-2725905.html
    I did read that article when it came out. After I get my watch, I should be able to get an idea of its performance.

  8. #7
    Member BarracksSi's Avatar
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    Re: time change

    Quote Originally Posted by ronalddheld View Post
    I did read that article when it came out. After I get my watch, I should be able to get an idea of its performance.
    You might be one to enjoy testing its performance purely in Airplane Mode for a while and see how well its internal timekeeping circuit performs.
    ronalddheld likes this.

  9. #8
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    Re: time change

    Quote Originally Posted by BarracksSi View Post
    You might be one to enjoy testing its performance purely in Airplane Mode for a while and see how well its internal timekeeping circuit performs.
    But how long can you keep the watch in airplane mode before you start itching?

    I keep my alarms on my phone so, I’d be annoyed tomorrow morning—though I suppose I could program my alarms on my watch instead of my phone. But for me, I would absolutely need my watch out of airplane mode with my next trip requiring Apple Maps and Pandora—in a few days.

  10. #9
    Moderator German Watches Forum
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    Re: time change

    Quote Originally Posted by BarracksSi View Post
    Cellular networks aren't known for timekeeping reliability (as unbelievable as it sounds). Apple avoids them by maintaining its own internet-accessed time servers -- I think they have three around the world -- and references them to the atomic clocks.

    This was an earlier thread; the linked article has a lot more detail:
    https://forums.watchuseek.com/f586/ap...l-2725905.html
    I have not read that cellular networks are unreliable. The frequency and
    time on the network need to be carefully synchronized for data flow and
    traffic hand off. The base station would go down if it loses sync with the
    network. It would drop the calls. If a base station did go down it would
    attempt to resynchronize. If you are not using the phone you wouldn't
    even notice the interruption and neither would the phone's clock.

    The network and the base stations are accurate enough for passing time to
    cellular phones. I read that thread earlier. It occurred to me there are plenty
    of public NTP servers, but maybe Apple wanted to avoid adding a noticeable
    load to a public resource. Adding dedicated servers would not be expensive
    compared to their other overhead.

    It also occurred to me that NTP servers can log the requests they receive.
    A cell phone request with serial number, base station ID, and time stamp
    could be about 10 Bytes. Those Apple NTP servers could track the locations
    of 100 million phones once an hour on about 25 GB/day. The cost is small,
    and they don't have tell you about it or ask the cellular providers' permission.

    Just something to think about.


    Thanks,
    rationaltime
    ronalddheld likes this.

  11. #10
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    Check the photos. Did this a year ago, cellphone time, gps time, and atomic time are all within a 0.1s. Been that way since ATT started using time.gov a couple of years ago.
    Attached Images Attached Images



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