超小ネタ。
しかも、なぜこれで月末日が取得できるのか、いまいち分かっていない…。
var m = 7;
var lastDay = new Date(2015, m + 1, 0).getDate();
console.log(lastDay); // 31
参考
date - Calculate last day of month in javascript - Stack Overflow ← これの1番上の回答
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