Year 30 June
23:59:60
31 December
23:59:60
1972 +1 second +1 second
1973   +1 second
1974   +1 second
1975   +1 second
1976   +1 second
1977   +1 second
1978   +1 second
1979   +1 second
1981 +1 second  
1982 +1 second  
1983 +1 second  
Year 30 June
23:59:60
31 December
23:59:60
1985 +1 second  
1987   +1 second
1989   +1 second
1990   +1 second
1992 +1 second  
1993 +1 second  
1994 +1 second  
1995   +1 second
1997 +1 second  
1998   +1 second
2005   +1 second