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1975 • 15 Episodes
Season 1 of One Day at a Time premiered on December 16, 1975
1976 • 24 Episodes
Season 2 of One Day at a Time premiered on September 28, 1976
1977 • 24 Episodes
Season 3 of One Day at a Time premiered on September 27, 1977
1978 • 26 Episodes
Season 4 of One Day at a Time premiered on September 18, 1978
1979 • 26 Episodes
Season 5 of One Day at a Time premiered on September 30, 1979
1980 • 21 Episodes
Season 6 of One Day at a Time premiered on November 9, 1980
1981 • 25 Episodes
Season 7 of One Day at a Time premiered on October 11, 1981
1982 • 26 Episodes
Season 8 of One Day at a Time premiered on September 26, 1982
1983 • 23 Episodes
Season 9 of One Day at a Time premiered on October 2, 1983