Sony has apologised to 'fat' PS3 owners affected by the system's 8001050F error.
The bug recognised 2010 as a leap year, and reset the clock of older PS3s yesterday (March 1st).
The fault meant the PS3 couldn't join PSN and left users unable to play certain games that used trophies, or performed trophy-sync checks online.
Sony said the problem had fixed itself earlier this morning.
A SCEE spokesperson told CVG:
"We are aware that the internal clock functionality in the PS3 units other than the slim model, recognized the year 2010 as a leap year.
"Having the internal clock date change from February 29 to March 1 (both GMT), we have verified that the symptoms are now resolved and that users are able to use their PS3 normally.
"If the time displayed on the XMB is still incorrect, users are able to adjust time settings manually or via the internet. If we have new information, we will update you through the PlayStation blog or PlayStation.com
"We apologise for any inconvenience this may have caused."