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.

1979 (MCMLXXIX) was a common year starting on Monday of the Gregorian calendar, the 1979th year of the Common Era (CE) and Anno Domini (AD) designations, the 979th year of the 2nd millennium, the 79th year of the 20th century, and the 10th and last year of the 1970s decade.