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2000 (MM) was a century leap year starting on Saturday in the Gregorian calendar. It was the 2000th year of the Common Era (CE) and Anno Domini (AD) designations, and the last year of the 2nd millennium and the 20th century.
2000 was designated the International Year for the Culture of Peace and the World Mathematical Year. It was also the first year of the 2000s decade.
Popular culture holds the year 2000 as the first year of the 21st century and the 3rd millennium, due to a tendency to group the years according to decimal values, as if the nonexistent year zero was counted. According to the Gregorian calendar , these distinctions fall to the year 2001, because the 1st century back then was also retroactively said to start with year 1. Since the Gregorian calendar doesn't have 0 as a year, its first millennium spanned from years 1 to 1000, and its second millennium from years 1001 to 2000. For more information, see century and millennium.
The year 2000 is sometimes abbreviated as "Y2K". The "Y" stands for "year", and the "K" stands for the Latin prefix "kilo-" (meaning "thousand").
Technology and certain parts of society were forced to deal with Y2K concerns, related to issues with computers not calculating dates properly after the year 1999. However, by the end of 1999, many companies had already converted to new, or upgraded, existing software. Some even obtained Y2K certification. As a result of massive effort, relatively few problems occurred.
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