0 then not a leap year 1 then year is a leap year

IDL> result = leapyr(2000)

Originally Written by: Trevor Harris, Physics Dept., University of Adelaide, 20/09/88 November 2004: correction for century years... S. Masson; Every year divisible by 4 is a leap year. But every year divisible by 100 is NOT a leap year Unless the year is also divisible by 400, then it is still a leap year. This means that year 1800, 1900, 2100, 2200, 2300 and 2500 are NOT leap years, while year 2000 and 2400 are leap years. + supress the automatic change 89 -> 1989 June 2005 update for new commons, Sebastien Masson.

cm_4cal