3 ms·

Except for every 400th year.

• _lce0 12y ago
  how about this? leap = function(x) { if ((x % 4) != 0) { return 0; } return Number( (x % 100) != 0 || (x % 400) == 0 ); } function(x) { return 28 + leap(x) + (...) };