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  1. #1
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    UK Daylight saving ?

    My Windows 7 PC has just synchronised with Internet Time and is still showing British Summer Time although we ended Daylight saving 2 days ago.

    My wife's "identical" PC correctly shows GMT.

    Both have United Kingdom as both the Current and Default location in Regional Settings, and "Automatically adjust clock for Daylight Saving Time" is checked.

    Is there another setting that could explain this ?

    Thanks

    Martin
    Last edited by MartinM; 2016-10-31 at 15:11.

  2. #2
    Super Moderator satrow's Avatar
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    Maybe you're using different time servers - though it's only in the last 24 hours that my time changed (time-nw.nist.gov).

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    MartinM (2016-10-31)

  4. #3
    Super Moderator BATcher's Avatar
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    If you wish to choose among a local pool of over 30 NTP time servers in the Czech Republic, use cz.pool.ntp.org
    In the UK, I use uk.pool.ntp.org to choose automatically from about 200 time servers in the UK.

    It's a rather nerdy (and time-consuming - tee-hee!) exercise to see which time servers are chosen from the pool. The results over a week of pinging showed heavy skewing towards the fastest ones; not particularly surprising!
    BATcher

    "The trouble with quotes on the internet is that you can never know if they are genuine."
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    MartinM (2016-10-31)

  6. #4
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    Thanks - uk.pool.ntp.org did it !
    That doesn't explain why the two are different (they were using the same time server) but I'm just happy its sorted.

  7. #5
    Super Moderator satrow's Avatar
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    Possibly just timing, Martin, esp. if the machines were online for differing periods (no such excuse possible for my machine though, it's been up and online since midday Wednesday and it took 18-20 hours minimum to change over).

  8. #6
    Super Moderator BATcher's Avatar
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    Martin - any NTP time server should work! It's just the thought that the time will be a few milliseconds more accurate if the time server is located 'close by'.

    By default, Windows checks the NTP time weekly at a random time, but the included time zone routines should change the internal time when the locale changes from daylight-saving to 'normal' time (and vice versa).
    BATcher

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  9. #7
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    Thanks BATcher (post #6)
    That's how I thought the time server worked.
    After I (successfully) refreshed the time on the delinquent PC, it was still showing BST rather than GMT.
    Isn't the daylight-saving change change embedded in Windows rather than in the time server ?
    Martin
    PS It is all working correctly now, so this is a purely academic discussion I don't like loose ends !

  10. #8
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    The DST change calendar is part of Windows (see the Windows updates that update time zones), the time source is always UTC.
    Why your PC decided to behave after the time server change only Windows knows.

    cheers, Paul

  11. #9
    Super Moderator BATcher's Avatar
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    Quote Originally Posted by MartinM View Post
    Thanks BATcher (post #6)
    That's how I thought the time server worked.
    After I (successfully) refreshed the time on the delinquent PC, it was still showing BST rather than GMT.
    Isn't the daylight-saving change change embedded in Windows rather than in the time server ?
    Martin
    PS It is all working correctly now, so this is a purely academic discussion I don't like loose ends !
    My only suggestion would be that the locale was not set to be UK, so Windows didn't change the time at 02:00 on Sunday.
    But you have already said that the locale was correct!
    BATcher

    "The trouble with quotes on the internet is that you can never know if they are genuine."
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