I've seen some incorrect information regards this issue and would like to clarify. 1) Bootcamp utility AppleTime only solves the issue of booting from OSX into Vista. It does not address the reverse situation of booting BACK into OSX from Vista.

2) In theory, if OS X checked the internet time right after login, there would be no issue, but I found on every system I use that even after login, OS X does NOT automatically check the internet and reset the clock back to correct time. This is even with the "set date and time automatically" option checked in System Prefs. I've personally watched and waited, and have seen some systems go several hours before correcting the clock. I don't know what the algorithm is that is used (anyone know?), but one would think that right after login would be a logical time to sync the clock, if the option is checked. Now, it may be I have something else wrong, and would welcome any input, but other than checking the box for "set date and time automatically", what else is to be done? (Other than manually opening system prefs and selecting Date/Time, then OS X dutifully goes out to the time server and retrieves the correct time.)

Therefore, this Lingon solution is useful, and not just for people who need correct time before login, as I can attest, even after login, OS X does not automatically sync the clock. I learned this the hard way using file synchronization software (Chronosync). I ran Chronosync after booting back from Vista one day, without noticing the clock, and Chronosync thought my source files were OLDER than the targets and overwrote them. This was because due to the clock being wrong, OS X thought the file modification time stamps on the source files were all 12 hours back from what they "really" were, and decided they need to overwritten by targets, even though in reality the targets were either older or the same.

My solution up till now (before I learned of Lingon) was to set Vista to use GMT time.

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