Users who didn't already update their PCs and devices for the earlier-than-usual Daylight Saving Time (DST) change-over could encounter time glitches on April 1, the "normally scheduled" DST start date.
As USA Today notes:
"There may be more (DST glitches) on Sunday night. It's likely that some consumers didn't upgrade their older devices. Instead, they changed their clocks manually. That's worked so far. But the devices are still programmed to change the time on the original daylight time start date. They will change the time by an hour unless that feature has been turned off."
Microsoft's guidance: If you haven't already updated your PCs and devices for Daylight Saving Time, consider the following steps.
* Verify the time and date programmed on your PCs and consumer electronic devices. Some older DVRs (ReplayTV, Tivo) and PDAs may need to be updated especially if they are not always connected to a network service.
* Download Microsoft's updates: Visit http://www.microsoft.com/dst2007 for more details.
And, no, this isn't an April Fool's joke....