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2.3GHz, 2.6GHz, or 2.7GHz quad-core Intel Core i7 processor (Turbo Boost up to 3.7GHz) with 6MB shared L3 cache.

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A1398 - My clock is ahead - Battery or SuperCap?

So, I’ve heard that the CMOS battery causes this problem, but in reading stuff on this site, I’m not really sure if I even have said battery… I think my machine might be too new? In which case, what are the possible solutions?

Update (11/15/2021)

Here is a screenshot.

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Update (11/17/2021)

Snapshot uploaded. Ironically, the coconut battery site wouldn’t load either, because… my clock was ahead. SO in those instances, I have to use Mozilla Firefox, which usually lets you bypass the warning and proceed to “unsafe” sites. A pain in the neck, but occasionally worth it.

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The models with user removable batteries used either a CMOS battery or a Super Cap to hold the settings within the PRAM when the battery was removed so they aren’t lost and powers the clock.

The newer non-user removable batteries like your system only use the main battery for holding the settings via a NVRAM which doesn’t loose the settings.

So why does your clock mess up? Your power is not 60 Hz which is what your clock logic uses for its timebase. To fix this you should use the Internet time server for your region. As an example I’m on the East coast of the USA and here is my settings

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I do use the internet time server for my region... everyone does. It doesn't make any difference; my clock looks okay by my watch, and I can reset the time til the cows come home, but the websites that demand up-to-date clocks won't let me in, including Wikipedia, which is fairly annoying, as I use it frequently - I just have to use my iPad to access it now. I've got around some of the other sites that won't let me view them - usually ones that I would download things from - by using Firefox, which will ignore the security warnings if you tell it to... but I don't think this is the ideal solution.


I'm guessing my battery is probably less than 100% functional. I don't ever really let it go all the way down to a zero charge, but I'm thinking the previous owner might not have been this careful... it's second-hand. But why re-setting the clock doesn't fix the problem, is something that nobody I've talked to has been able to explain. Clearly, the myth of the internet time server has a tremendous following, but it's still a myth. Just now, I reset my clock again, went to Wikipedia, and nope, my clock is still ahead, apparently. The next thing I'm going to be told is to upgrade my OS, which... if it's a hardware problem, how will that help?


What Myth??

Your system either leverages the beat of your power line (60 Hz) or an atomic clock who is accessible by the internet. Which one is more accurate??

Our modern world wouldn't be possible without a time server! From GPS to your cellular phone communication. Besides our time zone difference (hour) I can tell you my minute count will be exactly the same as yours! As well as any one else around the world.

Where are you? Country and the nearest major city as well as your power provider. Lets see if we can find the source of your problem locally. You could be pointing to the wrong server as you need to access a local one.

To check the battery let’s get a better view of things, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see Adding images to an existing question


Okay - I realize time servers exist... I'm just saying that pretty much every piece of advice out there on this issue more or less boils down to: "make sure you're set to your local server! (smiley face)" The MYTH is that this will somehow magically solve the problem, when - as you are correctly suggesting - there might be any number of factors that could be causing the issue.

I'm in Chicago, and I have exactly three options for an internet time server: Apple Americas, Apple Europe, Apple Asia. Nothing more specific than that. I get my internet through the phone company; if I brought my laptop to the public library, maybe I could get to a different time server? Not sure.

I've chosen Apple Americas, and my time zone is of course set to Central, with "set date and time automatically" selected. I unselect it, change time zones, save changes, and then go back to select it again so that my system will get reset to the right time, and I'm just saying, this doesn't help.

My power provider is Commonwealth Edison. I've tried adding an image to my comment, but I don't have that option. I think I could add it to an Answer, but not a comment.


@gginex - Well you've got the correct time server! Even still the polling can be messed up if your Internet connection is poor or other stuff is using the bandwidth.

What happens if you disable using the time service and just run on the systems internal clock is that any different?

At least you have a good power provider! Some countries power is very uneven! Here in the states we have mostly consistent power. In the middle of a heat wave the frequency can drift down as the voltage also is dropped to lessen the heat build up on the power lines and generation.

For the sake completeness lets get a snapshot of your battery via CoconutBattery maybe it is a factor here.


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