2000 (MM)was a century leap year starting on Saturday of the Gregorian calendar (dominical letter BA), the 2000th year of the Common Era (CE) and Anno Domini (AD) designations, the 1000th and last year of the 2nd millennium, the 100th and last year of the 20th century, and the 1st year of the 2000s decade.2000 was designated as: International Year for the Culture of Peace World Mathematical YearThe year 2000 was the first year of the 2000s decade.