On 1 January 2010, software that confused binary-coded decimal (BCD) dates with hexadecimal values began misreading the year 2010 as 2016. The defect affected mobile-phone software, including reported Windows Mobile 6 cases in which incoming SMS messages dated after 1 January were displayed as arriving in 2016. The failure was not merely cosmetic: upwards of 20 million bank cards in Germany became unusable, while customer-identification chips at Citibank Belgium also stopped working. Electronic funds-transfer terminals were among the other systems reported to be affected.
The same underlying date-handling weakness appeared in consumer hardware. Sony’s PlayStation 3 incorrectly treated 2010 as a leap year and attempted to process the nonexistent date 29 February, producing a system error; the Slim model was exempt. These incidents exposed how legacy representations and insufficient boundary testing could disable payment infrastructure and consumer products at a calendar transition. The source identifies workarounds and software corrections, but does not report a named executive, enforcement action, litigation outcome, or quantified financial loss tied to the failures.