Sony said the problem originated with older PlayStation 3 models incorrectly identifying 2010 as a leap year.

Sony said Monday that problems with its PlayStation 3 game console that made it incorrectly consider 2010 to be a leap year have been resolved.

The problem persisted through most of the Monday, March 1, which older PlayStations thought was Feb. 29, 2010, a date that doesn't exist.

Sony said on its blog that the problem resolved itself once the PlayStations' internal clock switched from "Feb. 29" to March 1 GMT.

"If the time displayed on the [XrossMediaBar] is still incorrect, users are able to adjust time settings manually or via the internet," the company's senior communications director, Patrick Seybold, wrote on the PlayStation blog.

Earlier Monday, Sony advised customers not to use the older PlayStation 3 systems until the problem is resolved.

The company warned that using the PlayStation could cause errors, potentially erasing users' game trophies, their accomplishments within certain games.

Some PlayStation users saw the date on their game consoles reset to Jan. 1, 2000.

The problem came just as PlayStation 3 sales are picking up. According to the NPD Group, 276,900 PS3s were sold in the U.S. in January, up from 203,200 a year earlier and following Christmas-season U.S. sales of 1.4 million in December.

The problem didn't appear to affect newer "slim" models of the PS3.

With files from The Associated Press