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  1. #1


    Member Since
    Oct 07, 2011
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    4
    Why does the time on my mac gradually get ahead
    It sounds weird but the time on my mac gradually gets ahead, over time.

    I reset the clock about a month ago to exactly the right time, and now it's 8 minutes fast.

    I know it's not much, but that's weird right??

    What's going on???????

    BTW - Serious post. lol

  2. #2

    IvanLasston's Avatar
    Member Since
    Feb 26, 2010
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    Rocky Mountain High, Colorado
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    Do you have a network connection? If so why not use network time?
     -> System preferences -> Date & Time -> Date & Time Tab -> check "Set date and time automatically"

    Computer clocks are notorious for drifts - always better to use ntp when you can.

  3. #3

    Raz0rEdge's Avatar
    Member Since
    Jul 17, 2009
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    MA
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    27" i7 iMac, 24" iMac, 13" Macbook Air, iPhone 6S, iPod Nano 7th GeniPad 3
    Do you have Mac to set time automatically or are you constantly setting it yourself? Every RTC has some jitter in it, some more than others and they will drift..setting the option to setting the time automatically will ensure that you are syncing with a remote NTP (network time protocol) server and correcting your local time. The sync should be happening frequently enough that you wouldn't/shouldn't notice any drift..
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    ...Ashwin



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  4. #4

    RavingMac's Avatar
    Member Since
    Jan 07, 2008
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    4GB Mac Mini 2012, 13" MBA, 15" MacBook Pro OSX 10.7, 32 GB iPhone 3GS, iPad2 64gb 3G
    Proximity to the Bermuda Triangle or an intergalactic wormhole?

    BTW - Not a serious post
    I've always wanted to be smart, handsome and modest. But, I guess I'll have to be satisfied with two out of three . . .

  5. #5


    Member Since
    Oct 07, 2011
    Posts
    4
    Thanks everyone!!!!!!!!!!!!!!!!!!!!!!
    Good replies

  6. #6


    Member Since
    Jan 09, 2012
    Posts
    19
    Your computer is from the future and is trying to return home.

  7. #7

    dekan's Avatar
    Member Since
    Mar 16, 2007
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    Maybe the Mac was right and all the other clocks just way too slow?

  8. #8


    Member Since
    Jan 17, 2010
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    1,466
    Specs:
    2.8 GHz 15" MacBook Pro OS X 10.7.x & some old Macs
    Quote Originally Posted by dekan View Post
    Maybe the Mac was right and all the other clocks just way too slow?
    Maybe it's just ahead of its time. Literally.

  9. #9

    BrianLachoreVPI's Avatar
    Member Since
    Feb 24, 2011
    Location
    Maryland
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    3,733
    Specs:
    March 2011 15" MBP 2.3GHz i7 Quad Core 8GB Ram | Mid 2011 27" iMac 3.4 GHz i7 16 GB RAM 2 TB HDD
    Quote Originally Posted by EndlessMac View Post
    Maybe it's just ahead of its time. Literally.
    A definite Razorism...

  10. #10


    Member Since
    Feb 24, 2011
    Location
    Los Angeles
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    331
    Quote Originally Posted by IvanLasston View Post
    Do you have a network connection? If so why not use network time?
     -> System preferences -> Date & Time -> Date & Time Tab -> check "Set date and time automatically"

    Computer clocks are notorious for drifts - always better to use ntp when you can.


    So, what exactly is time.apple.com? Is it linked to a government time standard perhaps? Or GMT? Or UTC?
    MacBook Pro 13.3" 2.66 GHz OS 10.9.5
    Memory: 8 GB 1067 MHz DDR3
    Date of Manufacture: Mid-2010

  11. #11

    vansmith's Avatar
    Member Since
    Oct 19, 2008
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    2012 13" MBP (2.5 i5, 8GB)
    time.apple.com is one of Apple's NTP servers (this old article suggests that Apple has three). NTP servers are simply servers set up such that clients (such as your machine) can synchronize their time.
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  12. #12


    Member Since
    Feb 24, 2011
    Location
    Los Angeles
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    331
    Quote Originally Posted by vansmith View Post
    time.apple.com is one of Apple's NTP servers (this old article suggests that Apple has three). NTP servers are simply servers set up such that clients (such as your machine) can synchronize their time.

    Okay. But what is the NTP server synchronized to? What time keeping standard?
    MacBook Pro 13.3" 2.66 GHz OS 10.9.5
    Memory: 8 GB 1067 MHz DDR3
    Date of Manufacture: Mid-2010

  13. #13

    IvanLasston's Avatar
    Member Since
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    Specs:
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    ntp.org: Home of the Network Time Protocol
    Ntp is the network time protocol. It is a pyramid of servers. Basically the top level servers are atomic clock synchronized. They pass sync info on down the chain until it gets to individual users.

  14. #14


    Member Since
    Feb 24, 2011
    Location
    Los Angeles
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    331
    Thanks.

    That seems like an odd way to do things. I mean, wouldn't that "passing down" process involve time delay and, therefore, inaccuracy? Or am misunderstanding?
    MacBook Pro 13.3" 2.66 GHz OS 10.9.5
    Memory: 8 GB 1067 MHz DDR3
    Date of Manufacture: Mid-2010

  15. #15

    IvanLasston's Avatar
    Member Since
    Feb 26, 2010
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    Specs:
    1.8 GHz i7 MBA 11" OSX 10.8.2
    If you are worried about that short of a delay - you are getting into quantum physics. Most drift shouldn't be more than a few milliseconds a day ( that may even be a lot) most ntp requests are once a day. It is a pyramid due to server load.

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