1984 (MCMLXXXIV) was a leap year starting on Sunday of the Gregorian calendar, the 1984th year of the Common Era (CE) and Anno Domini (AD) designations, the 984th year of the 2nd millennium, the 84th year of the 20th century, and the 5th year of the 1980s decade.

1983 (MCMLXXXIII) was a common year starting on Saturday of the Gregorian calendar, the 1983rd year of the Common Era (CE) and Anno Domini (AD) designations, the 983rd year of the 2nd millennium, the 83rd year of the 20th century, and the 4th year of the 1980s decade.