Longest years since 46 BC
(with some short ones added, just for fun...)
YearLength (sec)
46 BC38448000
197231622402
197631622401
199231622401
200831622401
Other Leap Years31622400
Common years031536000
1582130672000
1752230672000
0: in 1973, 1974, 1975, 1977, 1978, 1981, 1982, 1983, 1985, 1987, 1989, 1990, 1993, 1994, 1995, 1997, 1998, 2005: add one second.
1: in Catholic countries
2: in the United Kingdom and its colonies
Prior to the Julian reform of 46 BC, Roman years could be as long as 32659200 seconds. The Gregorian reform was taken up at various times around the world, and there may well be a local year of a different length of any of the above. They'll all be shorter than a common year, though, and I don't care :-)
YearLength (sec)
46 BC38448000
197231622402
197631622401
199231622401
200831622401
Other Leap Years31622400
Common years031536000
1582130672000
1752230672000
0: in 1973, 1974, 1975, 1977, 1978, 1981, 1982, 1983, 1985, 1987, 1989, 1990, 1993, 1994, 1995, 1997, 1998, 2005: add one second.
1: in Catholic countries
2: in the United Kingdom and its colonies
Prior to the Julian reform of 46 BC, Roman years could be as long as 32659200 seconds. The Gregorian reform was taken up at various times around the world, and there may well be a local year of a different length of any of the above. They'll all be shorter than a common year, though, and I don't care :-)