The World Prepares for the Year 2000 Bug

During the final decades of the twentieth century, computer programmers commonly recorded calendar years using only their last two digits. In the early eras of digital computing, data storage was exceedingly scarce and expensive, with early core memory costing up to a dollar per bit. To squeeze information onto standard eighty-column punched cards and conserve memory on mainframes like the IBM 1401, engineers systematically omitted the century prefix. It was widely assumed that software written in languages such as COBOL would be retired long before the calendar reached the next century.

As systems endured past their expected lifespans, the design choice created a structural dilemma. Without modification, software could not distinguish between the year 1900 and the year 2000. Bob Bemer, who had worked on software for a genealogy project in the late 1950s, published some of the earliest warnings about two-digit years in 1971 and 1979. By the mid-1990s, the impending calendar rollover gained wider prominence as the Year 2000 problem, often abbreviated as Y2K, a term credited to programmer David Eddy in 1995. Media attention and public anxiety grew quickly, fueled by concerns that financial networks, power grids, and critical public utilities could suddenly fail.