Solving the Mac OS 8’s Y2K20 Bug

Originally published at:

Keeping an old Mac running Mac OS 8 or earlier around for the fun of it? Beware that early versions of the classic Mac OS won’t let you set a time after the end of 2019. Happily, a free utility lets you work around this limitation for another 20 years.

Does one actually need to worry about it if the computer is not connected to the internet and the only activity is to play a game or retrieve an old file?

If everything is working OK on that computer, then just don’t rely on the time of day or date displayed, but there may be some apps that won’t run due to certificate issues. As stated in the article, should there be any problems, use the free utility.

1 Like

My understanding is that the time and date display and recording is accurate until about the year 2040.; the problem is that the last date you can reach in the settings is 2019-12-31. So, as long as you don’t need to touch the date settings control panel, you are fine for about the net 20 years.

I think it is inaccurate to call this a bug as it is certainly not a bug as it was designed specifically to behave this way.

And probably because no one in their right mind expected that ,achieves running Mac OS 8 would still be being used more than 20 years later, especially when Mac OS 9 was already in development.

Also, it you have an NTP utility, it will set your clock correctly until Feb 2040.

Having the y2k2020 problem and see that it can be solved with “Set Date” which i have downloaded , but I do not know what to do with it from there. Where are the files installed and what all is necessary to do to make it work ? Need Help on this , Thanks

Now, I’m thinking that I need to boot up my Mac SE (which can dual-boot between 6.0.8 and 7.5.5) and my IIGS to see if they will continue working.

If the date is wrong, it will be inconvenient, but probably of no consequence, but I should still take the time to find out.