1981 (MCMLXXXI) was a common year starting on Thursday of the Gregorian calendar, the 1981st year of the Common Era (CE) and Anno Domini (AD) designations, the 981st year of the 2nd millennium, the 81st year of the 20th century, and the 2nd year of the 1980s decade.

1980 (MCMLXXX) was a leap year starting on Tuesday of the Gregorian calendar, the 1980th year of the Common Era (CE) and Anno Domini (AD) designations, the 980th year of the 2nd millennium, the 80th year of the 20th century, and the 1st year of the 1980s decade.