Years having the most/longest

1981 is a year that is associated with the Rooster, which is the Chinese zodiac having the most letters in English, in contrast to the Ox, the one having the fewest, with which 1973 is associated.

Conversely, in the Vietnamese system, 1973 is a year that is associated with the Buffalo, which uses the most letters in English (7), tied with the Rooster, with which 1981 is associated.

If the Water Buffalo is used with a space, it uses 12 letters, the most in any Vietnamese zodiac.

Both 1973 and 1981 started in February of their respective Gregorian years and ended in January of the next in any zodiac system.

Plus, 1984 is a leap year; each leap year has 366 days, the most in a year.

Like the Rooster zodiac, Rat has the letter R, featuring the letter T.

1984 began in February and ended in the same month of the next in any Zodiac system.

Both 1960 and 2020 began in January of their Gregorian years and ended in February of the following years in the Chinese and Vietnamese zodiacs; they are also leap years.

1966, 1978 and 1990 are years of the Horse, but also years having the longest in any term.

Saturday, which is the day that has the highest syllable count (3), is when 1966 began on January 1 and ended on December 31; it is a day of the weekend that starts with S and contains U.

Plus, 1966 began in January and ended in February of the next in a Chinese or Vietnamese zodiac.

1978, if it uses the format "nineteen seventy eight," uses 20 letters, having tied with 1973 and 1977 for having the most letters in any year names of the 20th century.

Like 1966, which began and ended on Saturday, 1978 began and ended on Sunday, a day that likewise starts with S and contains U.

Furthermore, 1990, similar to 1966, began in January and ended in February of the next in any zodiac.

1990 also began and ended on a six-letter day (Monday) like 1978 (Sunday).