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tyfkda/is_leap.js

Last active August 29, 2015 14:15
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JavaScriptでうるう年判定 ref: http://qiita.com/tyfkda/items/bd2e2e93d5875547f8cf
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is_leap.js
// 与えられた西暦がうるう年かどうかを返す
function isLeap(year) {
// うるう年の場合、"2月29日"は2月のはず
return new Date(year, 2 - 1, 29).getMonth() == 2 - 1;
}
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