Y Bug (2K) - Roots Of The Problem, The Crisis Comes And Goes, In Hindsight

The phrase "Y2K bug" stood for the range of potentially adverse effects on computer systems of the rollover from the year 1999 to 2000. Within that definition, however, there were a wide range of questions, concerns, and solutions. The two-digit date-storage system posed its problem in the computer's recognition of time and its logical implications. Computers that already assumed the "19" and read and manipulated only the last two digits would naturally read the new date as "1900." Nobody knew for certain how this rollover would affect various systems, but few were willing to take chances. In the late 1990s, businesses, governments, organizations, individuals, and just about every other entity that depended on computer systems scrambled to render their systems Y2K-compliant, spending billions of dollars in the process.

Fears ranged from the relatively mundane (lost e-mail) to the costly (disruption of service or lost records) to the catastrophic (unpredictable computer responses at air-traffic controls and even nuclear facilities). One factor adding to the concern was the result of the increasingly networked nature of modern life. With computer systems interconnected with each other across state and national boundaries, analysts feared the potential snowball effects of moderate problems in local systems as they spread through wider networks. As wide-ranging as the concerns, however, were the reactions to the event—or nonevent—as the crucial date came and went.