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I was watching a video on youtube (using Chrome, OS is windows 7) when a pop up warned me that I had to calibrate my monitor again since the calibration was too old. This sounded strange, since I had done it yesterday, and I clicked it away to deal with it later. Then I locked the pc for some 30 minutes, and when I got back I found out some strange behaviour: facebook ssl certificate was expired, norton was disabled. I read with attention the error message of the ssl certificate and it was asking me if really today was may, 19th 2039. I fixed the date, restarted the computer and now everything seems fine.

What could have caused this leap forward by 26 years? I am updating my backup since it doesn't seem a good sign, but I would like to know if there is some diagnostics/check which I could try to understand what's going on.

Let me know if you need further details.

UPDATE: I add some further details, I was using a not-elevated account, with Chrome with the Adblock plugin. I use the Norton av and all the latest windows protection updated were installed, AFAIK.

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I would be suspicious that some malware used the date change to expose a vulnerability in the OS or browser. –  Daniel R Hicks May 19 '13 at 12:15
    
@DanielRHicks I am suspicious, too. But it could be a sign of impending hardware failure, no? –  Francesco May 20 '13 at 9:10
    
It could simply indicate that the clock battery is failing, eg, but what better way to disable Norton, et al? –  Daniel R Hicks May 20 '13 at 11:03
    
Daniel: they were duly disabled. But I was able to restore the date without any "apparent impediment", as soon as I tried it. –  Francesco May 20 '13 at 14:52
    
Yeah, once the malware's been installed (and permanently disabled Norton) there's no need to use the date trick anymore. Just sayin' ... –  Daniel R Hicks May 20 '13 at 21:06
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