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     27 
     28 function DaysInYear(y) {
     29   if (y % 4 != 0) return 365;
     30   if (y % 4 == 0 && y % 100 != 0) return 366;
     31   if (y % 100 == 0 && y % 400 != 0) return 365;
     32   if (y % 400 == 0) return 366;
     33 }
     34 assertEquals(365, DaysInYear(1999));
     35 assertEquals(366, DaysInYear(2000));
     36